256975906 has 16 divisors (see below), whose sum is σ = 428442048. Its totient is φ = 114602800.

The previous prime is 256975897. The next prime is 256975921. The reversal of 256975906 is 609579652.

It is a self number, because there is not a number n which added to its sum of digits gives 256975906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109030 + ... + 111361.

It is an arithmetic number, because the mean of its divisors is an integer number (26777628).

Almost surely, 2^256975906 is an apocalyptic number.

256975906 is a deficient number, since it is larger than the sum of its proper divisors (171466142).

256975906 is a wasteful number, since it uses less digits than its factorization.

256975906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220457.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The square root of 256975906 is about 16030.4680530545. The cubic root of 256975906 is about 635.7662488301.

The spelling of 256975906 in words is "two hundred fifty-six million, nine hundred seventy-five thousand, nine hundred six".