8128972761 has 16 divisors (see below), whose sum is σ = 13339853184. Its totient is φ = 4287809664.

The previous prime is 8128972729. The next prime is 8128972763. The reversal of 8128972761 is 1672798218.

It is not a de Polignac number, because 8128972761 - 2⁵ = 8128972729 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8128972763) 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 15 ways as a sum of consecutive naturals, for example, 14887956 + ... + 14888501.

It is an arithmetic number, because the mean of its divisors is an integer number (833740824).

Almost surely, 2^8128972761 is an apocalyptic number.

It is an amenable number.

8128972761 is a deficient number, since it is larger than the sum of its proper divisors (5210880423).

8128972761 is a wasteful number, since it uses less digits than its factorization.

8128972761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29776480.

The product of its digits is 677376, while the sum is 51.

The square root of 8128972761 is about 90160.8161065548. The cubic root of 8128972761 is about 2010.6904850334.

The spelling of 8128972761 in words is "eight billion, one hundred twenty-eight million, nine hundred seventy-two thousand, seven hundred sixty-one".