8720942517 has 20 divisors (see below), whose sum is σ = 14888664736. Its totient is φ = 4983395400.

The previous prime is 8720942501. The next prime is 8720942569. The reversal of 8720942517 is 7152490278.

It is a happy number.

8720942517 is a `hidden beast` number, since 8 + 7 + 209 + 425 + 17 = 666.

8720942517 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8720942517 - 2⁴ = 8720942501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8720941517) 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 19 ways as a sum of consecutive naturals, for example, 7689859 + ... + 7690992.

Almost surely, 2^8720942517 is an apocalyptic number.

It is an amenable number.

8720942517 is a deficient number, since it is larger than the sum of its proper divisors (6167722219).

8720942517 is a wasteful number, since it uses less digits than its factorization.

8720942517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15380870 (or 15380861 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 8720942517 is about 93385.9867271316. The cubic root of 8720942517 is about 2058.3590882902.

The spelling of 8720942517 in words is "eight billion, seven hundred twenty million, nine hundred forty-two thousand, five hundred seventeen".