180 (number)

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This article is about the number. For other uses, see 180 (disambiguation).
← 179 180 181 →
Cardinal one hundred eighty
Ordinal 180th
(one hundred and eightieth)
Factorization 22× 32× 5
Divisors 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, 180
Roman numeral CLXXX
Binary 101101002
Ternary 202003
Quaternary 23104
Quinary 12105
Senary 5006
Octal 2648
Duodecimal 13012
Hexadecimal B416
Vigesimal 9020
Base 36 5036

180 (one hundred [and] eighty) is the natural number following 179 and preceding 181.

In mathematics[edit]

180 is an abundant number, with its proper divisors summing up to 366.[1][2] 180 is also a highly composite number, a positive integer with more divisors than any smaller positive integer. One of the consequences of 180 having so many divisors is that it is a practical number, meaning that any positive number smaller than 180 that is not a divisor of 180 can be expressed as the sum of some of 180's divisors. 180 is a refactorable number.[3]

180 is the sum of two square numbers: 122 + 62. It can be expressed as either the sum of six consecutive prime numbers: 19 + 23 + 29 + 31 + 37 + 41, or the sum of eight consecutive prime numbers: 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37. 180 is an Ulam number, which can be expressed as a sum of earlier terms in the Ulam sequence only as 177 + 3.[4]

180 is a 61-gonal number.[2]

Half a circle has 180 degrees.[5]

Summing Euler's totient function φ(x) over the first + 24 integers gives 180.

180 is a Harshad number in base 10, and in binary it is a digitally balanced number, since its binary representation has the same number of zeros as ones (10110100).

In religion[edit]

The Book of Genesis says that Isaac died at the age of 180.[6]

In sports[edit]

  • The maximum possible score in one turn at darts (three triple 20s).
  • In archery the gent's clout shooting distance is 180 yards.[7]

In popular culture[edit]

In the Final Destination movies, 180 is often portrayed as cursed number and a lot of franchise-specific deaths occur with something related to number 180. (Flight 180, Mile Marker 180, Train 081...)

See also[edit]

References[edit]

  1. ^ "Positive Integers: 180". 
  2. ^ a b "The Number 180". VirtueScience.com. 
  3. ^ "Refactorable numbers". On-Line Encyclopedia of Integer Sequences. The OEIS Foundation. 2016-04-18. Retrieved 2016-04-18. 
  4. ^ "Ulam numbers". On-Line Encyclopedia of Integer Sequences. The OEIS Foundation. 2016-04-18. Retrieved 2016-04-18. 
  5. ^ Wells, D. (1987). The Penguin Dictionary of Curious and Interesting Numbers. London: Penguin Group. p. 142. ISBN 0-14-026149-4. 
  6. ^ Genesis 35:28-29
  7. ^ GNAS (2008). "Grand National Archery Society Rules of Shooting April 2008". 

External links[edit]