256391470 has 8 divisors (see below), whose sum is σ = 461504664. Its totient is φ = 102556584.

The previous prime is 256391459. The next prime is 256391539. The reversal of 256391470 is 74193652.

256391470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12819564 + ... + 12819583.

It is an arithmetic number, because the mean of its divisors is an integer number (57688083).

Almost surely, 2^256391470 is an apocalyptic number.

256391470 is a deficient number, since it is larger than the sum of its proper divisors (205113194).

256391470 is a wasteful number, since it uses less digits than its factorization.

256391470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25639154.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 256391470 is about 16012.2287642914. The cubic root of 256391470 is about 635.2839121437.

The spelling of 256391470 in words is "two hundred fifty-six million, three hundred ninety-one thousand, four hundred seventy".