866860686 has 48 divisors (see below), whose sum is σ = 1946196720. Its totient is φ = 278678400.

The previous prime is 866860637. The next prime is 866860703. The reversal of 866860686 is 686068668.

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 23 ways as a sum of consecutive naturals, for example, 48586 + ... + 63986.

It is an arithmetic number, because the mean of its divisors is an integer number (40545765).

Almost surely, 2^866860686 is an apocalyptic number.

866860686 is an abundant number, since it is smaller than the sum of its proper divisors (1079336034).

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

866860686 is a wasteful number, since it uses less digits than its factorization.

866860686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15521 (or 15518 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 54.

The square root of 866860686 is about 29442.4979578839. The cubic root of 866860686 is about 953.4906435383.

The spelling of 866860686 in words is "eight hundred sixty-six million, eight hundred sixty thousand, six hundred eighty-six".