686744564 has 24 divisors (see below), whose sum is σ = 1311744000. Its totient is φ = 311993280.

The previous prime is 686744543. The next prime is 686744579. The reversal of 686744564 is 465447686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131597 + ... + 136715.

It is an arithmetic number, because the mean of its divisors is an integer number (54656000).

Almost surely, 2^686744564 is an apocalyptic number.

It is an amenable number.

686744564 is a deficient number, since it is larger than the sum of its proper divisors (624999436).

686744564 is a wasteful number, since it uses less digits than its factorization.

686744564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8183 (or 8181 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 50.

The square root of 686744564 is about 26205.8116455110. The cubic root of 686744564 is about 882.2636984192.

The spelling of 686744564 in words is "six hundred eighty-six million, seven hundred forty-four thousand, five hundred sixty-four".