686967657 has 16 divisors (see below), whose sum is σ = 986615808. Its totient is φ = 423933840.

The previous prime is 686967653. The next prime is 686967707. The reversal of 686967657 is 756769686.

686967657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 686967657 - 2² = 686967653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 686967657.

It is not an unprimeable number, because it can be changed into a prime (686967653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158443 + ... + 162720.

It is an arithmetic number, because the mean of its divisors is an integer number (61663488).

Almost surely, 2^686967657 is an apocalyptic number.

It is an amenable number.

686967657 is a deficient number, since it is larger than the sum of its proper divisors (299648151).

686967657 is a wasteful number, since it uses less digits than its factorization.

686967657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321220.

The product of its digits is 22861440, while the sum is 60.

The square root of 686967657 is about 26210.0678556924. The cubic root of 686967657 is about 882.3592242551.

The spelling of 686967657 in words is "six hundred eighty-six million, nine hundred sixty-seven thousand, six hundred fifty-seven".