684408864 has 24 divisors (see below), whose sum is σ = 1796573520. Its totient is φ = 228136256.

The previous prime is 684408853. The next prime is 684408883. The reversal of 684408864 is 468804486.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3564534 + ... + 3564725.

It is an arithmetic number, because the mean of its divisors is an integer number (74857230).

Almost surely, 2^684408864 is an apocalyptic number.

It is an amenable number.

684408864 is an abundant number, since it is smaller than the sum of its proper divisors (1112164656).

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

684408864 is a wasteful number, since it uses less digits than its factorization.

684408864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7129272 (or 7129264 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 48.

The square root of 684408864 is about 26161.2091463678. The cubic root of 684408864 is about 881.2623343578.

The spelling of 684408864 in words is "six hundred eighty-four million, four hundred eight thousand, eight hundred sixty-four".