256875997 has 16 divisors (see below), whose sum is σ = 304387200. Its totient is φ = 212103360.

The previous prime is 256875989. The next prime is 256876003. The reversal of 256875997 is 799578652.

It is not a de Polignac number, because 256875997 - 2³ = 256875989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256875907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108654 + ... + 110992.

It is an arithmetic number, because the mean of its divisors is an integer number (19024200).

Almost surely, 2^256875997 is an apocalyptic number.

It is an amenable number.

256875997 is a deficient number, since it is larger than the sum of its proper divisors (47511203).

256875997 is a wasteful number, since it uses less digits than its factorization.

256875997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916.

The product of its digits is 9525600, while the sum is 58.

The square root of 256875997 is about 16027.3515279350. The cubic root of 256875997 is about 635.6838455098.

It can be divided in two parts, 25687 and 5997, that added together give a square (31684 = 178²).

The spelling of 256875997 in words is "two hundred fifty-six million, eight hundred seventy-five thousand, nine hundred ninety-seven".