686688432 has 20 divisors (see below), whose sum is σ = 1773945240. Its totient is φ = 228896128.

The previous prime is 686688383. The next prime is 686688451. The reversal of 686688432 is 234886686.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

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, 7152957 + ... + 7153052.

It is an arithmetic number, because the mean of its divisors is an integer number (88697262).

Almost surely, 2^686688432 is an apocalyptic number.

It is an amenable number.

686688432 is an abundant number, since it is smaller than the sum of its proper divisors (1087256808).

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

686688432 is a wasteful number, since it uses less digits than its factorization.

686688432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14306020 (or 14306014 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 51.

The square root of 686688432 is about 26204.7406398155. The cubic root of 686688432 is about 882.2396600902.

The spelling of 686688432 in words is "six hundred eighty-six million, six hundred eighty-eight thousand, four hundred thirty-two".