684008928 has 48 divisors (see below), whose sum is σ = 1995028560. Its totient is φ = 228002688.

The previous prime is 684008909. The next prime is 684008933. The reversal of 684008928 is 829800486.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

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, 394975 + ... + 396702.

It is an arithmetic number, because the mean of its divisors is an integer number (41563095).

Almost surely, 2^684008928 is an apocalyptic number.

It is an amenable number.

684008928 is an abundant number, since it is smaller than the sum of its proper divisors (1311019632).

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

684008928 is a wasteful number, since it uses less digits than its factorization.

684008928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791696 (or 791682 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The square root of 684008928 is about 26153.5643459931. The cubic root of 684008928 is about 881.0906449749.

The spelling of 684008928 in words is "six hundred eighty-four million, eight thousand, nine hundred twenty-eight".