256667624 has 16 divisors (see below), whose sum is σ = 484206720. Its totient is φ = 127545840.

The previous prime is 256667617. The next prime is 256667633. The reversal of 256667624 is 426766652.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97112 + ... + 99719.

It is an arithmetic number, because the mean of its divisors is an integer number (30262920).

Almost surely, 2^256667624 is an apocalyptic number.

It is an amenable number.

256667624 is a deficient number, since it is larger than the sum of its proper divisors (227539096).

256667624 is a wasteful number, since it uses less digits than its factorization.

256667624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197000 (or 196996 counting only the distinct ones).

The product of its digits is 725760, while the sum is 44.

The square root of 256667624 is about 16020.8496653580. The cubic root of 256667624 is about 635.5119140671.

The spelling of 256667624 in words is "two hundred fifty-six million, six hundred sixty-seven thousand, six hundred twenty-four".