256985862 has 16 divisors (see below), whose sum is σ = 587396352. Its totient is φ = 73424520.

The previous prime is 256985857. The next prime is 256985873. The reversal of 256985862 is 268589652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3059314 + ... + 3059397.

It is an arithmetic number, because the mean of its divisors is an integer number (36712272).

Almost surely, 2^256985862 is an apocalyptic number.

256985862 is an abundant number, since it is smaller than the sum of its proper divisors (330410490).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256985862 is a wasteful number, since it uses less digits than its factorization.

256985862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6118723.

The product of its digits is 2073600, while the sum is 51.

The square root of 256985862 is about 16030.7785837120. The cubic root of 256985862 is about 635.7744592069.

The spelling of 256985862 in words is "two hundred fifty-six million, nine hundred eighty-five thousand, eight hundred sixty-two".