Number: 80

Facts about the number: 80 is a common limit for the characters per line in computing (derived from the number of columns in IBM cards). 80 is the length (years) of the Eighty Years' War (1568–1648). 80 is the standard TCP/IP port number used for HTTP connections. 80 is the percentage of American men who say they would marry the same woman if they had it to do all over again. 80 is a ménage number, and is a Harshad number number in base 10. 80 is the smallest number n where n and n+1 are both products of 4 or more primes.
The number of digits in the number: \( n \): \( d = \lfloor \log_{10}(n) \rfloor + 1 \)	2
Sum of the digits: \( n \): \( S = \sum_{i=1}^{k} d_i \)	8
Reverse number: \( \text{Reverse}(n) = \sum_{i=1}^{k} d_i \cdot 10^{k-i} \)	0.0125
Binary number system: \( n = \sum_{i=0}^{k-1} d_i \cdot 2^i \)	1111100001111
Hexadecimal number system: \( n = \sum_{i=0}^{k-1} d_i \cdot 16^i \)	1f0f
Parity of the number: \( \text{Parity}(n) = n \mod 2 \)	even
Simplicity of the number: \(\text{IsPrime}(n) = n > 1 \land \forall d \in [2, \sqrt{n}], n \mod d \neq 0\)	false
The square root: \(\sqrt{n} = n^{\frac{1}{2}}\)	8.9442719099992
The factorial of the number: \( n!=n \times (n-1) \times (n-2) \times \ldots \times 2 \times 1 \)	7.1569457046264E+118
The sign of the number: \(\text{sign}(n) = \begin{cases} 1, & \text{if } n>0 \ 0, & \text{if } n=0 \ -1, & \text{if } n<0 \end{cases}\)	+
The nearest multiple of 10: \(\text{10}(n) = 10 \times \left\lfloor \frac{n + 5}{10} \right\rfloor\)	0
The nearest multiple of 100: \(\text{100}(n) = 100 \times \left\lfloor \frac{n + 50}{100} \right\rfloor\)	0
Sine: \(\sin(x) = \sum_{n=0}^{\infty} \frac{(-1)^n x^{2n+1}}{(2n+1)!}\)	-0.99388865392338
Cosine: \(\cos(x) = \sum_{n=0}^{\infty} \frac{(-1)^n x^{2n}}{(2n)!}\)	-0.11038724383905
Tangent: \(\tan(x) = \sum_{n=0}^{\infty} \frac{(-1)^n 2^{2n} (2^{2n} - 1) B_{2n} x^{2n-1}}{(2n)!}\)	9.0036549456071
The square of the number: \(\text{square}(n) = n^2\)	6400
Cubic root: \(\text{}(n) = \sqrt[3]{n}\)	4.3088693800638
Natural logarithm: \(\ln(ab) = \ln(a) + \ln(b)\)	4.3820266346739
Common logarithm: \(\log_{10}(ab) = \log_{10}(a) + \log_{10}(b)\)	1.9030899869919
All divisors of a number: \( D(n) = \{ d \in \mathbb{Z}^+ : n \mod d = 0 \} \)	1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Base64:	NzkuNTE=
SHA1:	4b866545ddb52060a1b1821eb50310ce1687ef1a
MD5:	21f86b2242447252766603204d0c3a67
Converts a number to a Roman representation:	LXXX
Converting the number of seconds to days, hours, minutes and seconds:	days: 0, hours: 0, minutes: 1, seconds: 20.
Converts a number to a date in UNIX time format:
	Chinese:	1970 月 1 星期四
	Spanish:	1970 Enero 1 Jueves
	English:	1970 January 1 Thursday
	Hindi:	1970 जनवरी 1 गुरुवार
	Arab:	1970 يناير 1 الخميس
	Bengal:	1970 জানুয়ারী 1 বৃহস্পতিবার
	Portuguese:	1970 Janeiro 1 Quinta-feira
	Russian:	1970 Январь 1 Четверг
	Japanese:	1970 一月 1 木曜日
	Lahnda:	1970 جنوری 1 جمعرات
	Marathi:	1970 जानेवारी 1 गुरुवार
	Telugu:	1970 జనవరి 1 గురువారం
	Malay:	1970 Januari 1 Khamis
	Turkish:	1970 Ocak 1 Perşembe
	Korean:	1970 1월 1 목요일
	French:	1970 Janvier 1 Jeudi
	German:	1970 Januar 1 Donnerstag
	Vietnamese:	1970 Tháng Một 1 Thứ năm
	Tamil:	1970 ஜனவரி 1 வியாழக்கிழமை
	Urdu:	1970 جنوری 1 جمعرات
	Javanese:	1970 Januari 1 Kemis
	Italian:	1970 Gennaio 1 Giovedì
	Persian:	1970 ژانویه 1 پنج‌شنبه
	Gujaratis:	1970 જાન્યુઆરી 1 ગુરુવાર
Length:
	80 kilometers = 80,000.00 meters
	80 miles = 128,747.20 meters
	80 feet = 24.38 meters
	80 inches = 2.03 meters
	80 yards = 73.15 meters
	80 meters = 0.08 kilometers
	80 meters = 0.05 miles
	80 meters = 262.47 feet
	80 meters = 3,149.61 inches
	80 meters = 87.49 yards
Weight:
	80 pounds = 36.29 kilograms
	80 grams = 0.08 kilograms
	80 ounces = 2.27 kilograms
	80 tons = 72,574.80 kilograms
	80 kilograms = 176.37 pounds
	80 kilograms = 80,000.00 grams
	80 kilograms = 2,821.92 ounces
	80 kilograms = 0.09 tons
Volume:
	80 gallons = 302.83 liters
	80 milliliters = 0.08 liters
	80 cubic meters = 80,000.00 liters
	80 liters = 21.13 gallons
	80 liters = 80,000.00 milliliters
	80 liters = 0.08 cubic meters
Area:
	80 acres = 323,748.80 square meters
	80 hectares = 800,000.00 square meters
	80 square feet = 7.43 square meters
	80 square inches = 0.05 square meters
	80 square meters = 0.02 acres
	80 square meters = 0.01 hectares
	80 square meters = 861.11 square feet
	80 square meters = 124,000.25 square inches
Temperature:
	80 celsius = 176.00 fahrenheit
	80 celsius = 353.15 kelvin
	80 fahrenheit = 26.67 celsius
	80 fahrenheit = 299.82 kelvin
	80 kelvin = -193.15 celsius
	80 kelvin = -315.67 fahrenheit
Time:
	80 seconds = 1.33 minutes
	80 seconds = 0.02 hours
	80 seconds = 0.00 days
	80 minutes = 4,800.00 seconds
	80 minutes = 1.33 hours
	80 minutes = 0.06 days
	80 hours = 288,000.00 seconds
	80 hours = 4,800.00 minutes
	80 hours = 3.33 days
	80 days = 6,912,000.00 seconds
	80 days = 115,200.00 minutes
	80 days = 1,920.00 hours
Energy:
	80 joules = 19.12 calories
	80 joules = 0.08 kilojoules
	80 joules = 0.02 watt hours
	80 calories = 334.72 joules
	80 calories = 0.33 kilojoules
	80 kilojoules = 80,000.00 joules
	80 kilojoules = 19,120.48 calories
	80 watt hours = 288,000.00 joules
	80 watt hours = 288.00 kilojoules
Information:
	80 bytes = 0.08 kilobytes
	80 kilobytes = 81,920.00 bytes
	80 kilobytes = 0.08 megabytes
	80 megabytes = 81,920.00 kilobytes
	80 megabytes = 0.08 gigabytes
	80 gigabytes = 81,920.00 megabytes
	80 gigabytes = 0.08 terabytes
	80 terabytes = 81,920.00 gigabytes