868657686 has 64 divisors (see below), whose sum is σ = 1896652800. Its totient is φ = 263640960.

The previous prime is 868657667. The next prime is 868657753. The reversal of 868657686 is 686756868.

868657686 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, 2964556 + ... + 2964848.

It is an arithmetic number, because the mean of its divisors is an integer number (29635200).

Almost surely, 2^868657686 is an apocalyptic number.

868657686 is an abundant number, since it is smaller than the sum of its proper divisors (1027995114).

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

868657686 is a wasteful number, since it uses less digits than its factorization.

868657686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701.

The product of its digits is 23224320, while the sum is 60.

The square root of 868657686 is about 29472.9992705188. Note that the first 3 decimals coincide. The cubic root of 868657686 is about 954.1490500166.

The spelling of 868657686 in words is "eight hundred sixty-eight million, six hundred fifty-seven thousand, six hundred eighty-six".