256456 has 8 divisors (see below), whose sum is σ = 480870. Its totient is φ = 128224.

The previous prime is 256441. The next prime is 256469. The reversal of 256456 is 654652.

It can be written as a sum of positive squares in only one way, i.e., 133956 + 122500 = 366^2 + 350^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16021 + ... + 16036.

2²⁵⁶⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

256456 is a deficient number, since it is larger than the sum of its proper divisors (224414).

256456 is a wasteful number, since it uses less digits than its factorization.

256456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32063 (or 32059 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 256456 is about 506.4148497033. The cubic root of 256456 is about 63.5337204910.

It can be divided in two parts, 25645 and 6, that added together give a triangular number (25651 = T₂₂₆).

The spelling of 256456 in words is "two hundred fifty-six thousand, four hundred fifty-six".