685307904 has 96 divisors (see below), whose sum is σ = 1853953920. Its totient is φ = 225075200.

The previous prime is 685307891. The next prime is 685307957. The reversal of 685307904 is 409703586.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 435439 + ... + 437009.

It is an arithmetic number, because the mean of its divisors is an integer number (19312020).

Almost surely, 2^685307904 is an apocalyptic number.

685307904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685307904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (926976960).

685307904 is an abundant number, since it is smaller than the sum of its proper divisors (1168646016).

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

685307904 is a wasteful number, since it uses less digits than its factorization.

685307904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1647 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 685307904 is about 26178.3861993057. The cubic root of 685307904 is about 881.6480411412.

The spelling of 685307904 in words is "six hundred eighty-five million, three hundred seven thousand, nine hundred four".