685115880 has 32 divisors (see below), whose sum is σ = 2055348000. Its totient is φ = 182697536.

The previous prime is 685115869. The next prime is 685115909. The reversal of 685115880 is 88511586.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 2854530 + ... + 2854769.

It is an arithmetic number, because the mean of its divisors is an integer number (64229625).

Almost surely, 2^685115880 is an apocalyptic number.

685115880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685115880 is an abundant number, since it is smaller than the sum of its proper divisors (1370232120).

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

685115880 is a wasteful number, since it uses less digits than its factorization.

685115880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709313 (or 5709309 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 42.

The square root of 685115880 is about 26174.7183365934. The cubic root of 685115880 is about 881.5656872108.

The spelling of 685115880 in words is "six hundred eighty-five million, one hundred fifteen thousand, eight hundred eighty".