270 (two hundred [and] seventy) is the natural number following 269 and preceding 271. In mathematics 270 is a harmonic divisor number 270 is the fourth number that is divisible by its average integer divisor 270 is a practical number, by the second definition The sum of the coprime counts for the first 29 integers is 270 270 is a sparsely totient number, the largest integer with 72 as its totient Given 6 elements, there are 270 square permutations 10! has 270 divisors 270 is a Harshad number in base 10 270 is the smallest positive integer that has divisors ending by digits 1, 2, ..., 9. 270 is the smallest sum of a set of even numbers that contain every digit once. In other fields The year 270 BC The year 270 AD The caliber of the .270 Winchester rifle The number of U.S. Electoral College votes needed to be elected President of the United States The average number of days in human pregnancy Integers from 271 to 279 271 272 272 = 24·17, sum of four consecutive primes (61 + 67 + 71 + 73), Euler number, primitive semiperfect number, pronic number. 272 is the smallest palindrome divisible by a fourth power. 273 274 274 = 2·137, tribonacci number, Smith number, nontotient, noncototient, centered triangular number, 27464 + 1 is prime 275 275 = 52·11. 275 is the sum of fifth powers of the first two primes. The maximal number of pieces that can be obtained by cutting an annulus with 22 cuts. 276 277 278 278 = 2·139 = Φ(30), nontotient. 278 is the smallest semiprime such that the next semiprime (287) is its anagram. 279 279 = 32·31. Every positive integer is the sum of at most 279 eighth powers. See Waring's problem. References Integers