864447172 has 24 divisors (see below), whose sum is σ = 1555507800. Its totient is φ = 420166656.

The previous prime is 864447149. The next prime is 864447187. The reversal of 864447172 is 271744468.

It can be written as a sum of positive squares in 4 ways, for example, as 65028096 + 799419076 = 8064^2 + 28274^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4404 + ... + 41812.

It is an arithmetic number, because the mean of its divisors is an integer number (64812825).

Almost surely, 2^864447172 is an apocalyptic number.

It is an amenable number.

864447172 is a deficient number, since it is larger than the sum of its proper divisors (691060628).

864447172 is a wasteful number, since it uses less digits than its factorization.

864447172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37575 (or 37573 counting only the distinct ones).

The product of its digits is 301056, while the sum is 43.

The square root of 864447172 is about 29401.4824796302. The cubic root of 864447172 is about 952.6049179579.

The spelling of 864447172 in words is "eight hundred sixty-four million, four hundred forty-seven thousand, one hundred seventy-two".