685397188 has 24 divisors (see below), whose sum is σ = 1386201600. Its totient is φ = 290440128.

The previous prime is 685397179. The next prime is 685397191. The reversal of 685397188 is 881793586.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135028 + ... + 140011.

It is an arithmetic number, because the mean of its divisors is an integer number (57758400).

Almost surely, 2^685397188 is an apocalyptic number.

It is an amenable number.

685397188 is an abundant number, since it is smaller than the sum of its proper divisors (700804412).

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

685397188 is a wasteful number, since it uses less digits than its factorization.

685397188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275139 (or 275137 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 55.

The square root of 685397188 is about 26180.0914436906. The cubic root of 685397188 is about 881.6863274089.

The spelling of 685397188 in words is "six hundred eighty-five million, three hundred ninety-seven thousand, one hundred eighty-eight".