851715864 has 32 divisors (see below), whose sum is σ = 2365878000. Its totient is φ = 283905216.

The previous prime is 851715857. The next prime is 851715901. The reversal of 851715864 is 468517158.

It is a congruent number.

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, 1971349 + ... + 1971780.

Almost surely, 2^851715864 is an apocalyptic number.

It is an amenable number.

851715864 is an abundant number, since it is smaller than the sum of its proper divisors (1514162136).

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

851715864 is a wasteful number, since it uses less digits than its factorization.

851715864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943144 (or 3943134 counting only the distinct ones).

The product of its digits is 268800, while the sum is 45.

The square root of 851715864 is about 29184.1714633121. The cubic root of 851715864 is about 947.9052140450.

The spelling of 851715864 in words is "eight hundred fifty-one million, seven hundred fifteen thousand, eight hundred sixty-four".