256988595 has 16 divisors (see below), whose sum is σ = 414323712. Its totient is φ = 136013280.

The previous prime is 256988587. The next prime is 256988629. The reversal of 256988595 is 595889652.

It is not a de Polignac number, because 256988595 - 2³ = 256988587 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63427 + ... + 67356.

It is an arithmetic number, because the mean of its divisors is an integer number (25895232).

Almost surely, 2^256988595 is an apocalyptic number.

256988595 is a deficient number, since it is larger than the sum of its proper divisors (157335117).

256988595 is a wasteful number, since it uses less digits than its factorization.

256988595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130922.

The product of its digits is 7776000, while the sum is 57.

The square root of 256988595 is about 16030.8638257581. The cubic root of 256988595 is about 635.7767129826.

The spelling of 256988595 in words is "two hundred fifty-six million, nine hundred eighty-eight thousand, five hundred ninety-five".