256813375 has 64 divisors (see below), whose sum is σ = 400038912. Its totient is φ = 160272000.

The previous prime is 256813369. The next prime is 256813379. The reversal of 256813375 is 573318652.

It is not a de Polignac number, because 256813375 - 2⁷ = 256813247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256813379) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1217020 + ... + 1217230.

It is an arithmetic number, because the mean of its divisors is an integer number (6250608).

Almost surely, 2^256813375 is an apocalyptic number.

256813375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256813375 is a deficient number, since it is larger than the sum of its proper divisors (143225537).

256813375 is a wasteful number, since it uses less digits than its factorization.

256813375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353 (or 343 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 256813375 is about 16025.3978109749. The cubic root of 256813375 is about 635.6321850076.

The spelling of 256813375 in words is "two hundred fifty-six million, eight hundred thirteen thousand, three hundred seventy-five".