686536880 has 40 divisors (see below), whose sum is σ = 1680212400. Its totient is φ = 260160768.

The previous prime is 686536871. The next prime is 686536901. The reversal of 686536880 is 88635686.

686536880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224315 + ... + 227354.

It is an arithmetic number, because the mean of its divisors is an integer number (42005310).

Almost surely, 2^686536880 is an apocalyptic number.

It is an amenable number.

686536880 is an abundant number, since it is smaller than the sum of its proper divisors (993675520).

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

686536880 is a wasteful number, since it uses less digits than its factorization.

686536880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451701 (or 451695 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 686536880 is about 26201.8487897324. The cubic root of 686536880 is about 882.1747519426.

The spelling of 686536880 in words is "six hundred eighty-six million, five hundred thirty-six thousand, eight hundred eighty".