686992872 has 32 divisors (see below), whose sum is σ = 1720414080. Its totient is φ = 228606720.

The previous prime is 686992847. The next prime is 686992903. The reversal of 686992872 is 278299686.

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, 9904 + ... + 38367.

It is an arithmetic number, because the mean of its divisors is an integer number (53762940).

Almost surely, 2^686992872 is an apocalyptic number.

It is an amenable number.

686992872 is an abundant number, since it is smaller than the sum of its proper divisors (1033421208).

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

686992872 is a wasteful number, since it uses less digits than its factorization.

686992872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48873 (or 48869 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 57.

The square root of 686992872 is about 26210.5488687284. The cubic root of 686992872 is about 882.3700197249.

The spelling of 686992872 in words is "six hundred eighty-six million, nine hundred ninety-two thousand, eight hundred seventy-two".