256813384 has 8 divisors (see below), whose sum is σ = 481525110. Its totient is φ = 128406688.

The previous prime is 256813379. The next prime is 256813399. The reversal of 256813384 is 483318652.

256813384 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 256704484 + 108900 = 16022^2 + 330^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×256813384² = 131906228403062912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16050829 + ... + 16050844.

Almost surely, 2^256813384 is an apocalyptic number.

It is an amenable number.

256813384 is a deficient number, since it is larger than the sum of its proper divisors (224711726).

256813384 is a wasteful number, since it uses less digits than its factorization.

256813384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32101679 (or 32101675 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 256813384 is about 16025.3980917792. The cubic root of 256813384 is about 635.6321924328.

The spelling of 256813384 in words is "two hundred fifty-six million, eight hundred thirteen thousand, three hundred eighty-four".