256555870 has 16 divisors (see below), whose sum is σ = 462091680. Its totient is φ = 102557664.

The previous prime is 256555853. The next prime is 256555951. The reversal of 256555870 is 78555652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10636 + ... + 25024.

It is an arithmetic number, because the mean of its divisors is an integer number (28880730).

Almost surely, 2^256555870 is an apocalyptic number.

256555870 is a deficient number, since it is larger than the sum of its proper divisors (205535810).

256555870 is a wasteful number, since it uses less digits than its factorization.

256555870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16179.

The product of its (nonzero) digits is 420000, while the sum is 43.

The square root of 256555870 is about 16017.3615180528. The cubic root of 256555870 is about 635.4196659586.

The spelling of 256555870 in words is "two hundred fifty-six million, five hundred fifty-five thousand, eight hundred seventy".