866643132 has 12 divisors (see below), whose sum is σ = 2022167336. Its totient is φ = 288881040.

The previous prime is 866643091. The next prime is 866643149. The reversal of 866643132 is 231346668.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36110119 + ... + 36110142.

Almost surely, 2^866643132 is an apocalyptic number.

It is an amenable number.

866643132 is an abundant number, since it is smaller than the sum of its proper divisors (1155524204).

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

866643132 is a wasteful number, since it uses less digits than its factorization.

866643132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72220268 (or 72220266 counting only the distinct ones).

The product of its digits is 124416, while the sum is 39.

The square root of 866643132 is about 29438.8031686072. The cubic root of 866643132 is about 953.4108717585.

The spelling of 866643132 in words is "eight hundred sixty-six million, six hundred forty-three thousand, one hundred thirty-two".