256804 has 24 divisors (see below), whose sum is σ = 492800. Its totient is φ = 116640.

The previous prime is 256801. The next prime is 256813. The reversal of 256804 is 408652.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (256801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2302 + ... + 2410.

2²⁵⁶⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

256804 is a deficient number, since it is larger than the sum of its proper divisors (235996).

256804 is a wasteful number, since it uses less digits than its factorization.

256804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 256804 is about 506.7583250426. The cubic root of 256804 is about 63.5624450306.

The spelling of 256804 in words is "two hundred fifty-six thousand, eight hundred four".