686456404 has 6 divisors (see below), whose sum is σ = 1201298714. Its totient is φ = 343228200.

The previous prime is 686456369. The next prime is 686456423. The reversal of 686456404 is 404654686.

It can be written as a sum of positive squares in only one way, i.e., 652700304 + 33756100 = 25548^2 + 5810^2 .

It is a super-2 number, since 2×686456404² = 942444789185222432, which contains 22 as substring.

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, 85807047 + ... + 85807054.

Almost surely, 2^686456404 is an apocalyptic number.

It is an amenable number.

686456404 is a deficient number, since it is larger than the sum of its proper divisors (514842310).

686456404 is a wasteful number, since it uses less digits than its factorization.

686456404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171614105 (or 171614103 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 43.

The square root of 686456404 is about 26200.3130515649. The cubic root of 686456404 is about 882.1402810245.

The spelling of 686456404 in words is "six hundred eighty-six million, four hundred fifty-six thousand, four hundred four".