686431216 has 20 divisors (see below), whose sum is σ = 1334668792. Its totient is φ = 342000576.

The previous prime is 686431201. The next prime is 686431217. The reversal of 686431216 is 612134686.

It is a happy number.

686431216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686431217) 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, 71271 + ... + 80326.

Almost surely, 2^686431216 is an apocalyptic number.

It is an amenable number.

686431216 is a deficient number, since it is larger than the sum of its proper divisors (648237576).

686431216 is a wasteful number, since it uses less digits than its factorization.

686431216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151888 (or 151882 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The square root of 686431216 is about 26199.8323658759. The cubic root of 686431216 is about 882.1294914968.

The spelling of 686431216 in words is "six hundred eighty-six million, four hundred thirty-one thousand, two hundred sixteen".