816566884 has 24 divisors (see below), whose sum is σ = 1704140928. Its totient is φ = 334741440.

The previous prime is 816566869. The next prime is 816566909. The reversal of 816566884 is 488665618.

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, 633337 + ... + 634624.

It is an arithmetic number, because the mean of its divisors is an integer number (71005872).

Almost surely, 2^816566884 is an apocalyptic number.

It is an amenable number.

816566884 is an abundant number, since it is smaller than the sum of its proper divisors (887574044).

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

816566884 is a wasteful number, since it uses less digits than its factorization.

816566884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267995 (or 1267993 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 52.

The square root of 816566884 is about 28575.6344461501. The cubic root of 816566884 is about 934.6820900569.

The spelling of 816566884 in words is "eight hundred sixteen million, five hundred sixty-six thousand, eight hundred eighty-four".