8721247572 has 18 divisors (see below), whose sum is σ = 22045375898. Its totient is φ = 2907082512.

The previous prime is 8721247559. The next prime is 8721247603. The reversal of 8721247572 is 2757421278.

8721247572 is a `hidden beast` number, since 8 + 72 + 1 + 2 + 4 + 7 + 572 = 666.

8721247572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 4849172496 + 3872075076 = 69636^2 + 62226^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121128403 + ... + 121128474.

Almost surely, 2^8721247572 is an apocalyptic number.

It is an amenable number.

8721247572 is an abundant number, since it is smaller than the sum of its proper divisors (13324128326).

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

8721247572 is a wasteful number, since it uses less digits than its factorization.

8721247572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242256887 (or 242256882 counting only the distinct ones).

The product of its digits is 439040, while the sum is 45.

The square root of 8721247572 is about 93387.6200146465. The cubic root of 8721247572 is about 2058.3830881965.

The spelling of 8721247572 in words is "eight billion, seven hundred twenty-one million, two hundred forty-seven thousand, five hundred seventy-two".