864087885 has 32 divisors (see below), whose sum is σ = 1565153280. Its totient is φ = 452147904.

The previous prime is 864087877. The next prime is 864087919. The reversal of 864087885 is 588780468.

It is not a de Polignac number, because 864087885 - 2³ = 864087877 is a prime.

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, 53229 + ... + 67538.

It is an arithmetic number, because the mean of its divisors is an integer number (48911040).

Almost surely, 2^864087885 is an apocalyptic number.

It is an amenable number.

864087885 is a deficient number, since it is larger than the sum of its proper divisors (701065395).

864087885 is a wasteful number, since it uses less digits than its factorization.

864087885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120834 (or 120828 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 54.

The square root of 864087885 is about 29395.3718295925. The cubic root of 864087885 is about 952.4729237762.

The spelling of 864087885 in words is "eight hundred sixty-four million, eighty-seven thousand, eight hundred eighty-five".