851811864 has 32 divisors (see below), whose sum is σ = 2141849520. Its totient is φ = 282294656.

The previous prime is 851811839. The next prime is 851811901. The reversal of 851811864 is 468118158.

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, 98427 + ... + 106730.

Almost surely, 2^851811864 is an apocalyptic number.

It is an amenable number.

851811864 is an abundant number, since it is smaller than the sum of its proper divisors (1290037656).

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

851811864 is a wasteful number, since it uses less digits than its factorization.

851811864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205339 (or 205335 counting only the distinct ones).

The product of its digits is 61440, while the sum is 42.

The square root of 851811864 is about 29185.8161441478. The cubic root of 851811864 is about 947.9408266578.

The spelling of 851811864 in words is "eight hundred fifty-one million, eight hundred eleven thousand, eight hundred sixty-four".