686656032 has 24 divisors (see below), whose sum is σ = 1802472336. Its totient is φ = 228885312.

The previous prime is 686656021. The next prime is 686656037. The reversal of 686656032 is 230656686.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (686656037) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576238 + ... + 3576429.

It is an arithmetic number, because the mean of its divisors is an integer number (75103014).

Almost surely, 2^686656032 is an apocalyptic number.

It is an amenable number.

686656032 is an abundant number, since it is smaller than the sum of its proper divisors (1115816304).

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

686656032 is a wasteful number, since it uses less digits than its factorization.

686656032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7152680 (or 7152672 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 686656032 is about 26204.1224237714. The cubic root of 686656032 is about 882.2257843094.

The spelling of 686656032 in words is "six hundred eighty-six million, six hundred fifty-six thousand, thirty-two".