864187880 has 32 divisors (see below), whose sum is σ = 1945706400. Its totient is φ = 345446976.

The previous prime is 864187879. The next prime is 864187889. The reversal of 864187880 is 88781468.

864187880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (864187889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62651 + ... + 75189.

It is an arithmetic number, because the mean of its divisors is an integer number (60803325).

Almost surely, 2^864187880 is an apocalyptic number.

It is an amenable number.

864187880 is an abundant number, since it is smaller than the sum of its proper divisors (1081518520).

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

864187880 is a wasteful number, since it uses less digits than its factorization.

864187880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14273 (or 14269 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 50.

The square root of 864187880 is about 29397.0726433773. The cubic root of 864187880 is about 952.5096634250.

The spelling of 864187880 in words is "eight hundred sixty-four million, one hundred eighty-seven thousand, eight hundred eighty".