256740872 has 16 divisors (see below), whose sum is σ = 483310800. Its totient is φ = 127858000.

The previous prime is 256740839. The next prime is 256740929. The reversal of 256740872 is 278047652.

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, 61922 + ... + 65937.

It is an arithmetic number, because the mean of its divisors is an integer number (30206925).

Almost surely, 2^256740872 is an apocalyptic number.

It is an amenable number.

256740872 is a deficient number, since it is larger than the sum of its proper divisors (226569928).

256740872 is a wasteful number, since it uses less digits than its factorization.

256740872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128116 (or 128112 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 256740872 is about 16023.1355233612. The cubic root of 256740872 is about 635.5723626069.

The spelling of 256740872 in words is "two hundred fifty-six million, seven hundred forty thousand, eight hundred seventy-two".