686959657 has 8 divisors (see below), whose sum is σ = 694653984. Its totient is φ = 679293888.

The previous prime is 686959631. The next prime is 686959667. The reversal of 686959657 is 756959686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686959657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686959595 and 686959604.

It is not an unprimeable number, because it can be changed into a prime (686959667) 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 in 7 ways as a sum of consecutive naturals, for example, 43198 + ... + 56920.

It is an arithmetic number, because the mean of its divisors is an integer number (86831748).

Almost surely, 2^686959657 is an apocalyptic number.

It is an amenable number.

686959657 is a deficient number, since it is larger than the sum of its proper divisors (7694327).

686959657 is a wasteful number, since it uses less digits than its factorization.

686959657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14279.

The product of its digits is 24494400, while the sum is 61.

The square root of 686959657 is about 26209.9152421369. The cubic root of 686959657 is about 882.3557991054.

The spelling of 686959657 in words is "six hundred eighty-six million, nine hundred fifty-nine thousand, six hundred fifty-seven".