8721318544 has 45 divisors (see below), whose sum is σ = 17394154281. Its totient is φ = 4236079680.

The previous prime is 8721318533. The next prime is 8721318559. The reversal of 8721318544 is 4458131278.

The square root of 8721318544 is 93388.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7803955600 + 917362944 = 88340^2 + 30288^2 .

It is a super-2 number, since 2×8721318544² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (215040) is a multiple of the sum of its prime factors (1344).

It is a self number, because there is not a number n which added to its sum of digits gives 8721318544.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 13821109 + ... + 13821739.

Almost surely, 2^8721318544 is an apocalyptic number.

8721318544 is the 93388-th square number.

It is an amenable number.

8721318544 is a deficient number, since it is larger than the sum of its proper divisors (8672835737).

8721318544 is an frugal number, since it uses more digits than its factorization.

8721318544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344 (or 670 counting only the distinct ones).

The product of its digits is 215040, while the sum is 43.

The cubic root of 8721318544 is about 2058.3886717695.

The spelling of 8721318544 in words is "eight billion, seven hundred twenty-one million, three hundred eighteen thousand, five hundred forty-four".