686751868 has 12 divisors (see below), whose sum is σ = 1311071832. Its totient is φ = 312159920.

The previous prime is 686751833. The next prime is 686751887. The reversal of 686751868 is 868157686.

It is a congruent number.

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, 7803955 + ... + 7804042.

It is an arithmetic number, because the mean of its divisors is an integer number (109255986).

Almost surely, 2^686751868 is an apocalyptic number.

It is an amenable number.

686751868 is a deficient number, since it is larger than the sum of its proper divisors (624319964).

686751868 is a wasteful number, since it uses less digits than its factorization.

686751868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15608012 (or 15608010 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 55.

The square root of 686751868 is about 26205.9510035412. The cubic root of 686751868 is about 882.2668262348.

The spelling of 686751868 in words is "six hundred eighty-six million, seven hundred fifty-one thousand, eight hundred sixty-eight".