685916884 has 24 divisors (see below), whose sum is σ = 1294950888. Its totient is φ = 316692480.

The previous prime is 685916863. The next prime is 685916909. The reversal of 685916884 is 488619586.

It can be written as a sum of positive squares in 4 ways, for example, as 493817284 + 192099600 = 22222^2 + 13860^2 .

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, 91557 + ... + 98764.

It is an arithmetic number, because the mean of its divisors is an integer number (53956287).

Almost surely, 2^685916884 is an apocalyptic number.

It is an amenable number.

685916884 is a deficient number, since it is larger than the sum of its proper divisors (609034004).

685916884 is a wasteful number, since it uses less digits than its factorization.

685916884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190395 (or 190393 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 685916884 is about 26190.0149675406. The cubic root of 685916884 is about 881.9091145769.

The spelling of 685916884 in words is "six hundred eighty-five million, nine hundred sixteen thousand, eight hundred eighty-four".