8717438721 has 16 divisors (see below), whose sum is σ = 12358483200. Its totient is φ = 5446871808.

The previous prime is 8717438711. The next prime is 8717438753. The reversal of 8717438721 is 1278347178.

It is not a de Polignac number, because 8717438721 - 2¹⁰ = 8717437697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8717438711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345406 + ... + 369783.

It is an arithmetic number, because the mean of its divisors is an integer number (772405200).

Almost surely, 2^8717438721 is an apocalyptic number.

It is an amenable number.

8717438721 is a deficient number, since it is larger than the sum of its proper divisors (3641044479).

8717438721 is a wasteful number, since it uses less digits than its factorization.

8717438721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715448.

The product of its digits is 526848, while the sum is 48.

The square root of 8717438721 is about 93367.2250899640. The cubic root of 8717438721 is about 2058.0833903977.

The spelling of 8717438721 in words is "eight billion, seven hundred seventeen million, four hundred thirty-eight thousand, seven hundred twenty-one".