256836 has 24 divisors (see below), whose sum is σ = 635040. Its totient is φ = 80512.

The previous prime is 256831. The next prime is 256873. The reversal of 256836 is 638652.

256836 = T₁₀₁ + T₁₀₂ + ... + T₁₃₆.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (256831) by changing a digit.

256836 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 7 ways as a sum of consecutive naturals, for example, 426 + ... + 833.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2²⁵⁶⁸³⁶ is an apocalyptic number.

It is an amenable number.

256836 is an abundant number, since it is smaller than the sum of its proper divisors (378204).

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

256836 is a wasteful number, since it uses less digits than its factorization.

256836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283 (or 1281 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 256836 is about 506.7898972947. The cubic root of 256836 is about 63.5650850645.

The spelling of 256836 in words is "two hundred fifty-six thousand, eight hundred thirty-six".