685259568 has 160 divisors (see below), whose sum is σ = 2303185920. Its totient is φ = 190978560.

The previous prime is 685259563. The next prime is 685259581. The reversal of 685259568 is 865952586.

685259568 is a `hidden beast` number, since 68 + 525 + 9 + 56 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685259563) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 121221 + ... + 126747.

It is an arithmetic number, because the mean of its divisors is an integer number (14394912).

Almost surely, 2^685259568 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685259568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1151592960).

685259568 is an abundant number, since it is smaller than the sum of its proper divisors (1617926352).

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

685259568 is a wasteful number, since it uses less digits than its factorization.

685259568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5592 (or 5580 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The square root of 685259568 is about 26177.4629786769. The cubic root of 685259568 is about 881.6273125795.

The spelling of 685259568 in words is "six hundred eighty-five million, two hundred fifty-nine thousand, five hundred sixty-eight".