8117720068 has 12 divisors (see below), whose sum is σ = 14219559900. Its totient is φ = 4054988672.

The previous prime is 8117720053. The next prime is 8117720069. The reversal of 8117720068 is 8600277118.

It can be written as a sum of positive squares in 2 ways, for example, as 4399403584 + 3718316484 = 66328^2 + 60978^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8117720068.

It is not an unprimeable number, because it can be changed into a prime (8117720069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963121 + ... + 971512.

It is an arithmetic number, because the mean of its divisors is an integer number (1184963325).

Almost surely, 2^8117720068 is an apocalyptic number.

It is an amenable number.

8117720068 is a deficient number, since it is larger than the sum of its proper divisors (6101839832).

8117720068 is a wasteful number, since it uses less digits than its factorization.

8117720068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1935686 (or 1935684 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 8117720068 is about 90098.3910400180. The cubic root of 8117720068 is about 2009.7622771091.

The spelling of 8117720068 in words is "eight billion, one hundred seventeen million, seven hundred twenty thousand, sixty-eight".