256808 has 16 divisors (see below), whose sum is σ = 492480. Its totient is φ = 125488.

The previous prime is 256801. The next prime is 256813. The reversal of 256808 is 808652.

It is a happy number.

It is a congruent number.

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

256808 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2²⁵⁶⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

256808 is a deficient number, since it is larger than the sum of its proper divisors (235672).

256808 is a wasteful number, since it uses less digits than its factorization.

256808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 732 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 256808 is about 506.7622716817. The cubic root of 256808 is about 63.5627750469.

The spelling of 256808 in words is "two hundred fifty-six thousand, eight hundred eight".