8879256721 has 2 divisors, whose sum is σ = 8879256722. Its totient is φ = 8879256720.

The previous prime is 8879256679. The next prime is 8879256761. The reversal of 8879256721 is 1276529788.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4448890000 + 4430366721 = 66700^2 + 66561^2 .

It is a cyclic number.

It is not a de Polignac number, because 8879256721 - 2⁷ = 8879256593 is a prime.

It is not a weakly prime, because it can be changed into another prime (8879256761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4439628360 + 4439628361.

It is an arithmetic number, because the mean of its divisors is an integer number (4439628361).

Almost surely, 2^8879256721 is an apocalyptic number.

It is an amenable number.

8879256721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8879256721 is an equidigital number, since it uses as much as digits as its factorization.

8879256721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The square root of 8879256721 is about 94229.8080280333. The cubic root of 8879256721 is about 2070.7398322435.

The spelling of 8879256721 in words is "eight billion, eight hundred seventy-nine million, two hundred fifty-six thousand, seven hundred twenty-one".