8720731724 has 24 divisors (see below), whose sum is σ = 15969493008. Its totient is φ = 4162466880.

The previous prime is 8720731673. The next prime is 8720731751. The reversal of 8720731724 is 4271370278.

8720731724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 548042 + ... + 563729.

It is an arithmetic number, because the mean of its divisors is an integer number (665395542).

Almost surely, 2^8720731724 is an apocalyptic number.

It is an amenable number.

8720731724 is a deficient number, since it is larger than the sum of its proper divisors (7248761284).

8720731724 is a wasteful number, since it uses less digits than its factorization.

8720731724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111865 (or 1111863 counting only the distinct ones).

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 8720731724 is about 93384.8581087962. The cubic root of 8720731724 is about 2058.3425040283.

The spelling of 8720731724 in words is "eight billion, seven hundred twenty million, seven hundred thirty-one thousand, seven hundred twenty-four".