256331978 has 16 divisors (see below), whose sum is σ = 440078784. Its totient is φ = 109693440.

The previous prime is 256331947. The next prime is 256331989. The reversal of 256331978 is 879133652.

256331978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3575 + ... + 22922.

It is an arithmetic number, because the mean of its divisors is an integer number (27504924).

Almost surely, 2^256331978 is an apocalyptic number.

256331978 is a deficient number, since it is larger than the sum of its proper divisors (183746806).

256331978 is a wasteful number, since it uses less digits than its factorization.

256331978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27197.

The product of its digits is 272160, while the sum is 44.

The square root of 256331978 is about 16010.3709513552. The cubic root of 256331978 is about 635.2347721391.

The spelling of 256331978 in words is "two hundred fifty-six million, three hundred thirty-one thousand, nine hundred seventy-eight".