256634210 has 32 divisors (see below), whose sum is σ = 558990720. Its totient is φ = 82812672.

The previous prime is 256634179. The next prime is 256634219. The reversal of 256634210 is 12436652.

It is a super-2 number, since 2×256634210² = 131722235484648200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256634219) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 106640 + ... + 109019.

It is an arithmetic number, because the mean of its divisors is an integer number (17468460).

Almost surely, 2^256634210 is an apocalyptic number.

256634210 is an abundant number, since it is smaller than the sum of its proper divisors (302356510).

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

256634210 is a wasteful number, since it uses less digits than its factorization.

256634210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215690.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 256634210 is about 16019.8068028301. The cubic root of 256634210 is about 635.4843350575.

The spelling of 256634210 in words is "two hundred fifty-six million, six hundred thirty-four thousand, two hundred ten".