686928212 has 12 divisors (see below), whose sum is σ = 1254390816. Its totient is φ = 328530840.

The previous prime is 686928211. The next prime is 686928217. The reversal of 686928212 is 212829686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686928211) 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, 3733214 + ... + 3733397.

It is an arithmetic number, because the mean of its divisors is an integer number (104532568).

Almost surely, 2^686928212 is an apocalyptic number.

It is an amenable number.

686928212 is a deficient number, since it is larger than the sum of its proper divisors (567462604).

686928212 is a wasteful number, since it uses less digits than its factorization.

686928212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7466638 (or 7466636 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 686928212 is about 26209.3153668691. The cubic root of 686928212 is about 882.3423358687.

The spelling of 686928212 in words is "six hundred eighty-six million, nine hundred twenty-eight thousand, two hundred twelve".