686657080 has 32 divisors (see below), whose sum is σ = 1546291440. Its totient is φ = 274429440.

The previous prime is 686657077. The next prime is 686657087. The reversal of 686657080 is 80756686.

It is a happy number.

686657080 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 686657080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686657087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44992 + ... + 58288.

Almost surely, 2^686657080 is an apocalyptic number.

It is an amenable number.

686657080 is an abundant number, since it is smaller than the sum of its proper divisors (859634360).

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

686657080 is a wasteful number, since it uses less digits than its factorization.

686657080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14599 (or 14595 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 686657080 is about 26204.1424206174. The cubic root of 686657080 is about 882.2262331377.

The spelling of 686657080 in words is "six hundred eighty-six million, six hundred fifty-seven thousand, eighty".