256918478 has 16 divisors (see below), whose sum is σ = 388662624. Its totient is φ = 127368480.

The previous prime is 256918477. The next prime is 256918489. The reversal of 256918478 is 874819652.

256918478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256918477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185348 + ... + 186728.

It is an arithmetic number, because the mean of its divisors is an integer number (24291414).

Almost surely, 2^256918478 is an apocalyptic number.

256918478 is a deficient number, since it is larger than the sum of its proper divisors (131744146).

256918478 is a wasteful number, since it uses less digits than its factorization.

256918478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107.

The product of its digits is 967680, while the sum is 50.

The square root of 256918478 is about 16028.6767388952. The cubic root of 256918478 is about 635.7188857592.

The spelling of 256918478 in words is "two hundred fifty-six million, nine hundred eighteen thousand, four hundred seventy-eight".