256739874 has 16 divisors (see below), whose sum is σ = 514039008. Its totient is φ = 85486752.

The previous prime is 256739863. The next prime is 256739881. The reversal of 256739874 is 478937652.

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 7 ways as a sum of consecutive naturals, for example, 17212 + ... + 28455.

It is an arithmetic number, because the mean of its divisors is an integer number (32127438).

Almost surely, 2^256739874 is an apocalyptic number.

256739874 is an abundant number, since it is smaller than the sum of its proper divisors (257299134).

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

256739874 is a wasteful number, since it uses less digits than its factorization.

256739874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46609.

The product of its digits is 2540160, while the sum is 51.

The square root of 256739874 is about 16023.1043808620. The cubic root of 256739874 is about 635.5715390761.

The spelling of 256739874 in words is "two hundred fifty-six million, seven hundred thirty-nine thousand, eight hundred seventy-four".