684785904 has 80 divisors (see below), whose sum is σ = 1954398720. Its totient is φ = 204871680.

The previous prime is 684785887. The next prime is 684785929. The reversal of 684785904 is 409587486.

It is a congruent number.

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, 33504 + ... + 49920.

It is an arithmetic number, because the mean of its divisors is an integer number (24429984).

Almost surely, 2^684785904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 684785904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977199360).

684785904 is an abundant number, since it is smaller than the sum of its proper divisors (1269612816).

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

684785904 is a wasteful number, since it uses less digits than its factorization.

684785904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16518 (or 16512 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 51.

The square root of 684785904 is about 26168.4142431291. The cubic root of 684785904 is about 881.4241334279.

The spelling of 684785904 in words is "six hundred eighty-four million, seven hundred eighty-five thousand, nine hundred four".