856870764 has 24 divisors (see below), whose sum is σ = 2000649840. Its totient is φ = 285440064.

The previous prime is 856870757. The next prime is 856870793. The reversal of 856870764 is 467078658.

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, 2779 + ... + 41490.

It is an arithmetic number, because the mean of its divisors is an integer number (83360410).

Almost surely, 2^856870764 is an apocalyptic number.

It is an amenable number.

856870764 is an abundant number, since it is smaller than the sum of its proper divisors (1143779076).

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

856870764 is a wasteful number, since it uses less digits than its factorization.

856870764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45889 (or 45887 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 51.

The square root of 856870764 is about 29272.3549445548. The cubic root of 856870764 is about 949.8137267287.

The spelling of 856870764 in words is "eight hundred fifty-six million, eight hundred seventy thousand, seven hundred sixty-four".