256756 has 6 divisors (see below), whose sum is σ = 449330. Its totient is φ = 128376.

The previous prime is 256723. The next prime is 256757. The reversal of 256756 is 657652.

It can be written as a sum of positive squares in only one way, i.e., 234256 + 22500 = 484^2 + 150^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256757) by changing a digit.

256756 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 as a sum of consecutive naturals, namely, 32091 + ... + 32098.

2²⁵⁶⁷⁵⁶ is an apocalyptic number.

It is an amenable number.

256756 is a deficient number, since it is larger than the sum of its proper divisors (192574).

256756 is a wasteful number, since it uses less digits than its factorization.

256756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64193 (or 64191 counting only the distinct ones).

The product of its digits is 12600, while the sum is 31.

The square root of 256756 is about 506.7109629759. The cubic root of 256756 is about 63.5584845686.

The spelling of 256756 in words is "two hundred fifty-six thousand, seven hundred fifty-six".