686266864 has 10 divisors (see below), whose sum is σ = 1329642080. Its totient is φ = 343133424.

The previous prime is 686266853. The next prime is 686266883. The reversal of 686266864 is 468662686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21445824 + ... + 21445855.

It is an arithmetic number, because the mean of its divisors is an integer number (132964208).

Almost surely, 2^686266864 is an apocalyptic number.

It is an amenable number.

686266864 is a deficient number, since it is larger than the sum of its proper divisors (643375216).

686266864 is a wasteful number, since it uses less digits than its factorization.

686266864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42891687 (or 42891681 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 52.

The square root of 686266864 is about 26196.6956694924. The cubic root of 686266864 is about 882.0590832194.

The spelling of 686266864 in words is "six hundred eighty-six million, two hundred sixty-six thousand, eight hundred sixty-four".