866431686 has 8 divisors (see below), whose sum is σ = 1732863384. Its totient is φ = 288810560.

The previous prime is 866431667. The next prime is 866431717. The reversal of 866431686 is 686134668.

866431686 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.

866431686 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72202635 + ... + 72202646.

It is an arithmetic number, because the mean of its divisors is an integer number (216607923).

Almost surely, 2^866431686 is an apocalyptic number.

866431686 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

866431686 is a wasteful number, since it uses less digits than its factorization.

866431686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144405286.

The product of its digits is 995328, while the sum is 48.

The square root of 866431686 is about 29435.2116690198. The cubic root of 866431686 is about 953.3333268402. Note that the first 4 decimals are identical.

The spelling of 866431686 in words is "eight hundred sixty-six million, four hundred thirty-one thousand, six hundred eighty-six".