256975 has 12 divisors (see below), whose sum is σ = 336040. Its totient is φ = 194400.

The previous prime is 256967. The next prime is 256981. The reversal of 256975 is 579652.

256975 = 63² + 64² + ... + 100².

It is not a de Polignac number, because 256975 - 2³ = 256967 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205 + ... + 745.

2²⁵⁶⁹⁷⁵ is an apocalyptic number.

256975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256975 is a deficient number, since it is larger than the sum of its proper divisors (79065).

256975 is a wasteful number, since it uses less digits than its factorization.

256975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570 (or 565 counting only the distinct ones).

The product of its digits is 18900, while the sum is 34.

The square root of 256975 is about 506.9270164432. The cubic root of 256975 is about 63.5765501672.

The spelling of 256975 in words is "two hundred fifty-six thousand, nine hundred seventy-five".