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