686961616 has 20 divisors (see below), whose sum is σ = 1451987424. Its totient is φ = 312255200.

The previous prime is 686961577. The next prime is 686961637. The reversal of 686961616 is 616169686.

It is a self number, because there is not a number n which added to its sum of digits gives 686961616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1951420 + ... + 1951771.

Almost surely, 2^686961616 is an apocalyptic number.

It is an amenable number.

686961616 is an abundant number, since it is smaller than the sum of its proper divisors (765025808).

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

686961616 is a wasteful number, since it uses less digits than its factorization.

686961616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3903210 (or 3903204 counting only the distinct ones).

The product of its digits is 559872, while the sum is 49.

The square root of 686961616 is about 26209.9526134635. The cubic root of 686961616 is about 882.3566378414.

The spelling of 686961616 in words is "six hundred eighty-six million, nine hundred sixty-one thousand, six hundred sixteen".