256604621 has 24 divisors (see below), whose sum is σ = 324664704. Its totient is φ = 201005280.

The previous prime is 256604591. The next prime is 256604627. The reversal of 256604621 is 126406652.

It is a de Polignac number, because none of the positive numbers 2^k-256604621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256604627) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63656 + ... + 67566.

It is an arithmetic number, because the mean of its divisors is an integer number (13527696).

Almost surely, 2^256604621 is an apocalyptic number.

It is an amenable number.

256604621 is a deficient number, since it is larger than the sum of its proper divisors (68060083).

256604621 is a wasteful number, since it uses less digits than its factorization.

256604621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041 (or 4034 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 256604621 is about 16018.8832631991. The cubic root of 256604621 is about 635.4599111005.

The spelling of 256604621 in words is "two hundred fifty-six million, six hundred four thousand, six hundred twenty-one".