28621277617 has 2 divisors, whose sum is σ = 28621277618. Its totient is φ = 28621277616.

The previous prime is 28621277609. The next prime is 28621277669. The reversal of 28621277617 is 71677212682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28620518976 + 758641 = 169176^2 + 871^2 .

It is a cyclic number.

It is not a de Polignac number, because 28621277617 - 2³ = 28621277609 is a prime.

It is not a weakly prime, because it can be changed into another prime (28621277017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14310638808 + 14310638809.

It is an arithmetic number, because the mean of its divisors is an integer number (14310638809).

Almost surely, 2^28621277617 is an apocalyptic number.

It is an amenable number.

28621277617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28621277617 is an equidigital number, since it uses as much as digits as its factorization.

28621277617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 49.

The spelling of 28621277617 in words is "twenty-eight billion, six hundred twenty-one million, two hundred seventy-seven thousand, six hundred seventeen".