686878788 has 24 divisors (see below), whose sum is σ = 1628992960. Its totient is φ = 225205920.

The previous prime is 686878783. The next prime is 686878789. The reversal of 686878788 is 887878686.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (686878783) 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, 468448 + ... + 469911.

Almost surely, 2^686878788 is an apocalyptic number.

It is an amenable number.

686878788 is an abundant number, since it is smaller than the sum of its proper divisors (942114172).

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

686878788 is a wasteful number, since it uses less digits than its factorization.

686878788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938427 (or 938425 counting only the distinct ones).

The product of its digits is 57802752, while the sum is 66.

The square root of 686878788 is about 26208.3724790381. The cubic root of 686878788 is about 882.3211740584.

The spelling of 686878788 in words is "six hundred eighty-six million, eight hundred seventy-eight thousand, seven hundred eighty-eight".