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

Ordinal One hundred and
eighty
Cardinal 180th
Factorization 2^2 \cdot 3^2 \cdot 5
Roman numeral CLXXX
Binary 10110100
Duodecimal 130
Hexadecimal B4
Vigesimal 90

In mathematics

One hundred eighty is the sum of six consecutive primes (19 + 23 + 29 + 31 + 37 + 41), as well as the sum of eight consecutive primes (11 + 13 + 17 + 19 + 23 + 29 + 31 + 37).

Using degrees (°) to measure angles, 180° is called straight angle, and makes a semicircle. 180° is equivalent to π rads. In normal space, the interior angles of a triangle add up to 180°.

180 is a Harshad number in base 10.

In other fields

  • 180° also means antipode. For example, a "180-degree change" indicates a radical change.
  • Interstate 180, the designation of some spur routes of Interstate 80.
  • The maximum possible score in one turn at darts.
  • In astronomy, when two planets are 180 degrees apart, they are said to be in opposition. In astrology, this is an aspect that is considered to be negative in influence.

Other numbers in the 180s

181 = prime number, Chen prime, palindromic prime, star number, centered square number, centered pentagonal number, sum of five consecutive primes (29 + 31 + 37 + 41 + 43)


182 = 2 7 13, sphenic number, pronic number, nontotient


183 = 3 61


184 = 2^3 23, sum of four consecutive primes (41 + 43 + 47 + 53)


185, see 185 (number)


186 = 2 3 31, sphenic number, nontotient


187 = 11 17, sum of three consecutive primes (59 + 61 + 67), sum of nine consecutive primes (7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37), self number


188 = 2^2 47, nontotient, untouchable number


189 = 3^3 7 = 63+(-3)3 = 43+53, centered cube number


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