256904 has 16 divisors (see below), whose sum is σ = 510300. Its totient is φ = 120832.

The previous prime is 256903. The next prime is 256931. The reversal of 256904 is 409652.

It can be written as a sum of positive squares in 2 ways, for example, as 252004 + 4900 = 502^2 + 70^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809 + ... + 1080.

2²⁵⁶⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

256904 is a deficient number, since it is larger than the sum of its proper divisors (253396).

256904 is a wasteful number, since it uses less digits than its factorization.

256904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1912 (or 1908 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 256904 is about 506.8569818006. The cubic root of 256904 is about 63.5706944084.

The spelling of 256904 in words is "two hundred fifty-six thousand, nine hundred four".