256973885 has 16 divisors (see below), whose sum is σ = 359616000. Its totient is φ = 176209488.

The previous prime is 256973869. The next prime is 256973909. The reversal of 256973885 is 588379652.

It is not a de Polignac number, because 256973885 - 2⁴ = 256973869 is a prime.

It is a congruent number.

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, 73205 + ... + 76634.

It is an arithmetic number, because the mean of its divisors is an integer number (22476000).

Almost surely, 2^256973885 is an apocalyptic number.

It is an amenable number.

256973885 is a deficient number, since it is larger than the sum of its proper divisors (102642115).

256973885 is an equidigital number, since it uses as much as digits as its factorization.

256973885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149865 (or 149851 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 53.

The square root of 256973885 is about 16030.4050167175. The cubic root of 256973885 is about 635.7645821538.

The spelling of 256973885 in words is "two hundred fifty-six million, nine hundred seventy-three thousand, eight hundred eighty-five".