686343685 has 8 divisors (see below), whose sum is σ = 824620536. Its totient is φ = 548402880.

The previous prime is 686343661. The next prime is 686343719. The reversal of 686343685 is 586343686.

It can be written as a sum of positive squares in 4 ways, for example, as 53670276 + 632673409 = 7326^2 + 25153^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 686343685 - 2⁹ = 686343173 is a prime.

It is a Duffinian number.

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, 79494 + ... + 87703.

It is an arithmetic number, because the mean of its divisors is an integer number (103077567).

Almost surely, 2^686343685 is an apocalyptic number.

It is an amenable number.

686343685 is a deficient number, since it is larger than the sum of its proper divisors (138276851).

686343685 is a wasteful number, since it uses less digits than its factorization.

686343685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168023.

The product of its digits is 2488320, while the sum is 49.

The square root of 686343685 is about 26198.1618630010. The cubic root of 686343685 is about 882.0919946790.

Subtracting from 686343685 its reverse (586343686), we obtain a palindrome (99999999).

The spelling of 686343685 in words is "six hundred eighty-six million, three hundred forty-three thousand, six hundred eighty-five".