685606984 has 8 divisors (see below), whose sum is σ = 1285513110. Its totient is φ = 342803488.

The previous prime is 685606949. The next prime is 685606997. The reversal of 685606984 is 489606586.

It can be written as a sum of positive squares in only one way, i.e., 628906084 + 56700900 = 25078^2 + 7530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42850429 + ... + 42850444.

Almost surely, 2^685606984 is an apocalyptic number.

It is an amenable number.

685606984 is a deficient number, since it is larger than the sum of its proper divisors (599906126).

685606984 is a wasteful number, since it uses less digits than its factorization.

685606984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85700879 (or 85700875 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 52.

The square root of 685606984 is about 26184.0979222123. The cubic root of 685606984 is about 881.7762778775.

The spelling of 685606984 in words is "six hundred eighty-five million, six hundred six thousand, nine hundred eighty-four".