864188972 has 12 divisors (see below), whose sum is σ = 1514549736. Its totient is φ = 431460480.

The previous prime is 864188933. The next prime is 864189019. The reversal of 864188972 is 279881468.

It is a happy 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, 155429 + ... + 160892.

It is an arithmetic number, because the mean of its divisors is an integer number (126212478).

Almost surely, 2^864188972 is an apocalyptic number.

It is an amenable number.

864188972 is a deficient number, since it is larger than the sum of its proper divisors (650360764).

864188972 is a wasteful number, since it uses less digits than its factorization.

864188972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317008 (or 317006 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 53.

The square root of 864188972 is about 29397.0912166493. The cubic root of 864188972 is about 952.5100646264.

The spelling of 864188972 in words is "eight hundred sixty-four million, one hundred eighty-eight thousand, nine hundred seventy-two".