686634544 has 40 divisors (see below), whose sum is σ = 1385223840. Its totient is φ = 329433600.

The previous prime is 686634523. The next prime is 686634587. The reversal of 686634544 is 445436686.

It is a junction number, because it is equal to n+sod(n) for n = 686634494 and 686634503.

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, 31437 + ... + 48595.

It is an arithmetic number, because the mean of its divisors is an integer number (34630596).

Almost surely, 2^686634544 is an apocalyptic number.

It is an amenable number.

686634544 is an abundant number, since it is smaller than the sum of its proper divisors (698589296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686634544 is a wasteful number, since it uses less digits than its factorization.

686634544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17269 (or 17263 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 46.

The square root of 686634544 is about 26203.7124087409. The cubic root of 686634544 is about 882.2165815137.

The spelling of 686634544 in words is "six hundred eighty-six million, six hundred thirty-four thousand, five hundred forty-four".