685688318 has 32 divisors (see below), whose sum is σ = 1231546368. Its totient is φ = 280130400.

The previous prime is 685688257. The next prime is 685688323. The reversal of 685688318 is 813886586.

It is a self number, because there is not a number n which added to its sum of digits gives 685688318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17288 + ... + 40868.

It is an arithmetic number, because the mean of its divisors is an integer number (38485824).

Almost surely, 2^685688318 is an apocalyptic number.

685688318 is a deficient number, since it is larger than the sum of its proper divisors (545858050).

685688318 is a wasteful number, since it uses less digits than its factorization.

685688318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23688.

The product of its digits is 2211840, while the sum is 53.

The square root of 685688318 is about 26185.6509943900. The cubic root of 685688318 is about 881.8111450622.

The spelling of 685688318 in words is "six hundred eighty-five million, six hundred eighty-eight thousand, three hundred eighteen".