684866884640 has 48 divisors (see below), whose sum is σ = 1619758969920. Its totient is φ = 273648602880.

The previous prime is 684866884613. The next prime is 684866884643. The reversal of 684866884640 is 46488668486.

It is not an unprimeable number, because it can be changed into a prime (684866884643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2181806 + ... + 2475885.

It is an arithmetic number, because the mean of its divisors is an integer number (33744978540).

Almost surely, 2^684866884640 is an apocalyptic number.

It is an amenable number.

684866884640 is an abundant number, since it is smaller than the sum of its proper divisors (934892085280).

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

684866884640 is a wasteful number, since it uses less digits than its factorization.

684866884640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658625 (or 4658617 counting only the distinct ones).

The product of its (nonzero) digits is 339738624, while the sum is 68.

The spelling of 684866884640 in words is "six hundred eighty-four billion, eight hundred sixty-six million, eight hundred eighty-four thousand, six hundred forty".