8641128722 has 6 divisors (see below), whose sum is σ = 12961890279. Its totient is φ = 4320498630.

The previous prime is 8641128721. The next prime is 8641128737. The reversal of 8641128722 is 2278211468.

It can be written as a sum of positive squares in only one way, i.e., 4320564361 + 4320564361 = 65731^2 + 65731^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=65731.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8641128722.

It is not an unprimeable number, because it can be changed into a prime (8641128721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 98597 + ... + 164327.

Almost surely, 2^8641128722 is an apocalyptic number.

8641128722 is a deficient number, since it is larger than the sum of its proper divisors (4320761557).

8641128722 is an frugal number, since it uses more digits than its factorization.

8641128722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131464 (or 65733 counting only the distinct ones).

The product of its digits is 86016, while the sum is 41.

The square root of 8641128722 is about 92957.6716683459. The cubic root of 8641128722 is about 2052.0604880226.

The spelling of 8641128722 in words is "eight billion, six hundred forty-one million, one hundred twenty-eight thousand, seven hundred twenty-two".