256828 has 24 divisors (see below), whose sum is σ = 529200. Its totient is φ = 107520.

The previous prime is 256813. The next prime is 256831. The reversal of 256828 is 828652.

It is a self number, because there is not a number n which added to its sum of digits gives 256828.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 348 + ... + 796.

It is an arithmetic number, because the mean of its divisors is an integer number (22050).

2²⁵⁶⁸²⁸ is an apocalyptic number.

It is an amenable number.

256828 is an abundant number, since it is smaller than the sum of its proper divisors (272372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256828 is a wasteful number, since it uses less digits than its factorization.

256828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 256828 is about 506.7820044161. The cubic root of 256828 is about 63.5644250766.

The spelling of 256828 in words is "two hundred fifty-six thousand, eight hundred twenty-eight".