686876520 has 64 divisors (see below), whose sum is σ = 2247963840. Its totient is φ = 166515200.

The previous prime is 686876419. The next prime is 686876537. The reversal of 686876520 is 25678686.

686876520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 686876520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258861 + ... + 261500.

It is an arithmetic number, because the mean of its divisors is an integer number (35124435).

Almost surely, 2^686876520 is an apocalyptic number.

686876520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686876520 is an abundant number, since it is smaller than the sum of its proper divisors (1561087320).

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

686876520 is a wasteful number, since it uses less digits than its factorization.

686876520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520386 (or 520382 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 48.

The square root of 686876520 is about 26208.3292103865. The cubic root of 686876520 is about 882.3202029474.

The spelling of 686876520 in words is "six hundred eighty-six million, eight hundred seventy-six thousand, five hundred twenty".