180 (number)

The number 180 is a number that comes after 179 and before 181. It is an even number and a whole number.

• 180 is a composite number, which means it can be divided by numbers other than 1 and itself.
• It has many divisors: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 90, and 180.
• The prime factors of 180 are 2, 3, and 5. Written in prime factorization, it is 2^2×3^2×5.
• 180 is a Harshad number, which means it can be divided by the sum of its digits (1 + 8 + 0 = 9).

• 180 degrees is the measure of a straight angle. A straight line makes a 180-degree angle.
• In a triangle, the sum of the three angles is always 180 degrees.

• People sometimes say "doing a 180" when they mean making a complete change in direction or opinion.
• In darts, scoring 180 in one turn (three darts hitting triple 20) is the highest possible score.