686989686 has 64 divisors (see below), whose sum is σ = 1515278016. Its totient is φ = 206745600.

The previous prime is 686989673. The next prime is 686989697.

686989686 is nontrivially palindromic in base 10.

686989686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253756 + ... + 256448.

It is an arithmetic number, because the mean of its divisors is an integer number (23676219).

Almost surely, 2^686989686 is an apocalyptic number.

686989686 is an abundant number, since it is smaller than the sum of its proper divisors (828288330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686989686 is a wasteful number, since it uses less digits than its factorization.

686989686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817.

The product of its digits is 53747712, while the sum is 66.

The square root of 686989686 is about 26210.4880916018. The cubic root of 686989686 is about 882.3686556956.

The spelling of 686989686 in words is "six hundred eighty-six million, nine hundred eighty-nine thousand, six hundred eighty-six".