256577628 has 12 divisors (see below), whose sum is σ = 598681160. Its totient is φ = 85525872.

The previous prime is 256577609. The next prime is 256577641. The reversal of 256577628 is 826775652.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10690723 + ... + 10690746.

Almost surely, 2^256577628 is an apocalyptic number.

It is an amenable number.

256577628 is an abundant number, since it is smaller than the sum of its proper divisors (342103532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256577628 is a wasteful number, since it uses less digits than its factorization.

256577628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21381476 (or 21381474 counting only the distinct ones).

The product of its digits is 1411200, while the sum is 48.

The square root of 256577628 is about 16018.0407041560. The cubic root of 256577628 is about 635.4376283492.

The spelling of 256577628 in words is "two hundred fifty-six million, five hundred seventy-seven thousand, six hundred twenty-eight".