685639604 has 12 divisors (see below), whose sum is σ = 1292167044. Its totient is φ = 316449024.

The previous prime is 685639589. The next prime is 685639639. The reversal of 685639604 is 406936586.

685639604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 127735204 + 557904400 = 11302^2 + 23620^2 .

It is a congruent number.

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, 6592637 + ... + 6592740.

It is an arithmetic number, because the mean of its divisors is an integer number (107680587).

Almost surely, 2^685639604 is an apocalyptic number.

It is an amenable number.

685639604 is a deficient number, since it is larger than the sum of its proper divisors (606527440).

685639604 is a wasteful number, since it uses less digits than its factorization.

685639604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13185394 (or 13185392 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 685639604 is about 26184.7208119544. The cubic root of 685639604 is about 881.7902621215.

The spelling of 685639604 in words is "six hundred eighty-five million, six hundred thirty-nine thousand, six hundred four".