180 (one hundred [and] eighty) is the natural number following 179 and preceding 181.
180 is an abundant number, with its proper divisors summing up to 366.
Half a circle has 180 degrees,[7] and thus a U-turn is also referred to as a 180.
Summing Euler's totient function φ(x) over the first + 24 integers gives 180.
A triangle has three interior angles that collectively total 180 degrees.