686653685 has 8 divisors (see below), whose sum is σ = 825707520. Its totient is φ = 548174224.

The previous prime is 686653621. The next prime is 686653703. The reversal of 686653685 is 586356686.

It is a happy number.

686653685 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 686653685 - 2⁶ = 686653621 is a prime.

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, 140957 + ... + 145746.

It is an arithmetic number, because the mean of its divisors is an integer number (103213440).

Almost surely, 2^686653685 is an apocalyptic number.

It is an amenable number.

686653685 is a deficient number, since it is larger than the sum of its proper divisors (139053835).

686653685 is a wasteful number, since it uses less digits than its factorization.

686653685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287187.

The product of its digits is 6220800, while the sum is 53.

The square root of 686653685 is about 26204.0776407032. The cubic root of 686653685 is about 882.2247791548.

The spelling of 686653685 in words is "six hundred eighty-six million, six hundred fifty-three thousand, six hundred eighty-five".