256356 has 18 divisors (see below), whose sum is σ = 648102. Its totient is φ = 85440.

The previous prime is 256349. The next prime is 256363. The reversal of 256356 is 653652.

256356 is a `hidden beast` number, since 25 + 635 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (256349) and next prime (256363).

It can be written as a sum of positive squares in only one way, i.e., 147456 + 108900 = 384^2 + 330^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an unprimeable number.

256356 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 5 ways as a sum of consecutive naturals, for example, 3525 + ... + 3596.

2²⁵⁶³⁵⁶ is an apocalyptic number.

It is an amenable number.

256356 is an abundant number, since it is smaller than the sum of its proper divisors (391746).

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

256356 is a wasteful number, since it uses less digits than its factorization.

256356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131 (or 7126 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 256356 is about 506.3161067950. The cubic root of 256356 is about 63.5254615070.

The spelling of 256356 in words is "two hundred fifty-six thousand, three hundred fifty-six".