684576864 has 36 divisors (see below), whose sum is σ = 1946766276. Its totient is φ = 228192192.

The previous prime is 684576847. The next prime is 684576883. The reversal of 684576864 is 468675486.

684576864 is a `hidden beast` number, since 6 + 8 + 4 + 576 + 8 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 684576864.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1188214 + ... + 1188789.

It is an arithmetic number, because the mean of its divisors is an integer number (54076841).

Almost surely, 2^684576864 is an apocalyptic number.

It is an amenable number.

684576864 is an abundant number, since it is smaller than the sum of its proper divisors (1262189412).

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

684576864 is a wasteful number, since it uses less digits than its factorization.

684576864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2377019 (or 2377008 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The square root of 684576864 is about 26164.4198101162. The cubic root of 684576864 is about 881.3344354890.

The spelling of 684576864 in words is "six hundred eighty-four million, five hundred seventy-six thousand, eight hundred sixty-four".