180 is the natural number following one hundred seventy-nine and preceding one hundred eighty-one.

Ordinal	One hundred [and] eighty
Cardinal	180th
Factorization
Roman numeral	CLXXX
Binary	10110100
Hexadecimal	B4

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). 180 is a Harshad number.

In normal space, the interior angles of a triangle add up to 180 degrees.

One hundred eighty is also

• Interstate 180, the designation of some spur routes of Interstate 80.
• The year AD 180 or 180 BC.
• 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, 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