867808644 has 48 divisors (see below), whose sum is σ = 2134278720. Its totient is φ = 274019200.

The previous prime is 867808573. The next prime is 867808661. The reversal of 867808644 is 446808768.

It is a super-2 number, since 2×867808644² = 1506183685202237472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5082 + ... + 41969.

It is an arithmetic number, because the mean of its divisors is an integer number (44464140).

Almost surely, 2^867808644 is an apocalyptic number.

It is an amenable number.

867808644 is an abundant number, since it is smaller than the sum of its proper divisors (1266470076).

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

867808644 is a wasteful number, since it uses less digits than its factorization.

867808644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47140 (or 47138 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 51.

The square root of 867808644 is about 29458.5920233809. The cubic root of 867808644 is about 953.8380810684.

The spelling of 867808644 in words is "eight hundred sixty-seven million, eight hundred eight thousand, six hundred forty-four".