686057704 has 8 divisors (see below), whose sum is σ = 1286358210. Its totient is φ = 343028848.

The previous prime is 686057699. The next prime is 686057707. The reversal of 686057704 is 407750686.

It can be written as a sum of positive squares in only one way, i.e., 665536804 + 20520900 = 25798^2 + 4530^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (686057707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42878599 + ... + 42878614.

Almost surely, 2^686057704 is an apocalyptic number.

It is an amenable number.

686057704 is a deficient number, since it is larger than the sum of its proper divisors (600300506).

686057704 is a wasteful number, since it uses less digits than its factorization.

686057704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85757219 (or 85757215 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 43.

The square root of 686057704 is about 26192.7032587322. The cubic root of 686057704 is about 881.9694629692.

The spelling of 686057704 in words is "six hundred eighty-six million, fifty-seven thousand, seven hundred four".