686778896 has 20 divisors (see below), whose sum is σ = 1388488512. Its totient is φ = 328459296.

The previous prime is 686778881. The next prime is 686778907. The reversal of 686778896 is 698877686.

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, 932756 + ... + 933491.

Almost surely, 2^686778896 is an apocalyptic number.

It is an amenable number.

686778896 is an abundant number, since it is smaller than the sum of its proper divisors (701709616).

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

686778896 is a wasteful number, since it uses less digits than its factorization.

686778896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866278 (or 1866272 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 65.

The square root of 686778896 is about 26206.4666828628. The cubic root of 686778896 is about 882.2784003303.

The spelling of 686778896 in words is "six hundred eighty-six million, seven hundred seventy-eight thousand, eight hundred ninety-six".