8721719424 has 192 divisors, whose sum is σ = 28048718880. Its totient is φ = 2578329600.

The previous prime is 8721719411. The next prime is 8721719429. The reversal of 8721719424 is 4249171278.

8721719424 is a `hidden beast` number, since 8 + 7 + 217 + 1 + 9 + 424 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a self number, because there is not a number n which added to its sum of digits gives 8721719424.

It is not an unprimeable number, because it can be changed into a prime (8721719429) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 511159 + ... + 527945.

Almost surely, 2^8721719424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8721719424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14024359440).

8721719424 is an abundant number, since it is smaller than the sum of its proper divisors (19326999456).

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

8721719424 is a wasteful number, since it uses less digits than its factorization.

8721719424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16859 (or 16844 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 8721719424 is about 93390.1462896381. The cubic root of 8721719424 is about 2058.4202095928.

The spelling of 8721719424 in words is "eight billion, seven hundred twenty-one million, seven hundred nineteen thousand, four hundred twenty-four".