685509318 has 112 divisors (see below), whose sum is σ = 1691177040. Its totient is φ = 207012672.

The previous prime is 685509301. The next prime is 685509329. The reversal of 685509318 is 813905586.

685509318 is a `hidden beast` number, since 6 + 8 + 550 + 93 + 1 + 8 = 666.

It is a congruent number.

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 55 ways as a sum of consecutive naturals, for example, 1117980 + ... + 1118592.

It is an arithmetic number, because the mean of its divisors is an integer number (15099795).

Almost surely, 2^685509318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685509318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (845588520).

685509318 is an abundant number, since it is smaller than the sum of its proper divisors (1005667722).

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

685509318 is a wasteful number, since it uses less digits than its factorization.

685509318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 685509318 is about 26182.2328688750. The cubic root of 685509318 is about 881.7344056613.

The spelling of 685509318 in words is "six hundred eighty-five million, five hundred nine thousand, three hundred eighteen".