256604 has 6 divisors (see below), whose sum is σ = 449064. Its totient is φ = 128300.

The previous prime is 256603. The next prime is 256609. The reversal of 256604 is 406652.

It is a super-2 number, since 2×256604² = 131691225632, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 256604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32072 + ... + 32079.

It is an arithmetic number, because the mean of its divisors is an integer number (74844).

2²⁵⁶⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

256604 is a deficient number, since it is larger than the sum of its proper divisors (192460).

256604 is a wasteful number, since it uses less digits than its factorization.

256604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64155 (or 64153 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 256604 is about 506.5609538841. The cubic root of 256604 is about 63.5459398482.

The spelling of 256604 in words is "two hundred fifty-six thousand, six hundred four".