685851564 has 24 divisors (see below), whose sum is σ = 1651944448. Its totient is φ = 221242320.

The previous prime is 685851563. The next prime is 685851583. The reversal of 685851564 is 465158586.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (685851563) 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 7 ways as a sum of consecutive naturals, for example, 921472 + ... + 922215.

Almost surely, 2^685851564 is an apocalyptic number.

It is an amenable number.

685851564 is an abundant number, since it is smaller than the sum of its proper divisors (966092884).

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

685851564 is a wasteful number, since it uses less digits than its factorization.

685851564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843725 (or 1843723 counting only the distinct ones).

The product of its digits is 1152000, while the sum is 48.

The square root of 685851564 is about 26188.7678977076. The cubic root of 685851564 is about 881.8811188953.

The spelling of 685851564 in words is "six hundred eighty-five million, eight hundred fifty-one thousand, five hundred sixty-four".