8720668705 has 16 divisors (see below), whose sum is σ = 12033154944. Its totient is φ = 5943196800.

The previous prime is 8720668703. The next prime is 8720668727. The reversal of 8720668705 is 5078660278.

It is not a de Polignac number, because 8720668705 - 2¹ = 8720668703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8720668703) 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, 758596 + ... + 770005.

It is an arithmetic number, because the mean of its divisors is an integer number (752072184).

Almost surely, 2^8720668705 is an apocalyptic number.

It is an amenable number.

8720668705 is a deficient number, since it is larger than the sum of its proper divisors (3312486239).

8720668705 is a wasteful number, since it uses less digits than its factorization.

8720668705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528776.

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 8720668705 is about 93384.5206926715. The cubic root of 8720668705 is about 2058.3375459199.

The spelling of 8720668705 in words is "eight billion, seven hundred twenty million, six hundred sixty-eight thousand, seven hundred five".