685317408 has 24 divisors (see below), whose sum is σ = 1798958448. Its totient is φ = 228439104.

The previous prime is 685317397. The next prime is 685317427. The reversal of 685317408 is 804713586.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 685317408.

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, 3569266 + ... + 3569457.

It is an arithmetic number, because the mean of its divisors is an integer number (74956602).

Almost surely, 2^685317408 is an apocalyptic number.

It is an amenable number.

685317408 is an abundant number, since it is smaller than the sum of its proper divisors (1113641040).

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

685317408 is a wasteful number, since it uses less digits than its factorization.

685317408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7138736 (or 7138728 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 685317408 is about 26178.5677224710. The cubic root of 685317408 is about 881.6521167517.

The spelling of 685317408 in words is "six hundred eighty-five million, three hundred seventeen thousand, four hundred eight".