686626616 has 32 divisors (see below), whose sum is σ = 1387562400. Its totient is φ = 316652160.

The previous prime is 686626609. The next prime is 686626663. The reversal of 686626616 is 616626686.

686626616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686626616² = 942912219599222912, which contains 22 as substring.

It is a congruent number.

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, 213581 + ... + 216771.

It is an arithmetic number, because the mean of its divisors is an integer number (43361325).

Almost surely, 2^686626616 is an apocalyptic number.

It is an amenable number.

686626616 is an abundant number, since it is smaller than the sum of its proper divisors (700935784).

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

686626616 is a wasteful number, since it uses less digits than its factorization.

686626616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5279 (or 5275 counting only the distinct ones).

The product of its digits is 746496, while the sum is 47.

The square root of 686626616 is about 26203.5611320294. The cubic root of 686626616 is about 882.2131860928.

The spelling of 686626616 in words is "six hundred eighty-six million, six hundred twenty-six thousand, six hundred sixteen".