8721313648 has 20 divisors (see below), whose sum is σ = 16986019968. Its totient is φ = 4337824640.

The previous prime is 8721313609. The next prime is 8721313649. The reversal of 8721313648 is 8463131278.

8721313648 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×8721313648² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8721313649) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1423861 + ... + 1429972.

Almost surely, 2^8721313648 is an apocalyptic number.

It is an amenable number.

8721313648 is a deficient number, since it is larger than the sum of its proper divisors (8264706320).

8721313648 is a wasteful number, since it uses less digits than its factorization.

8721313648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854032 (or 2854026 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The square root of 8721313648 is about 93387.9737867783. The cubic root of 8721313648 is about 2058.3882865880.

The spelling of 8721313648 in words is "eight billion, seven hundred twenty-one million, three hundred thirteen thousand, six hundred forty-eight".