28540965217 has 2 divisors, whose sum is σ = 28540965218. Its totient is φ = 28540965216.

The previous prime is 28540965191. The next prime is 28540965221. The reversal of 28540965217 is 71256904582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15356414241 + 13184550976 = 123921^2 + 114824^2 .

It is a cyclic number.

It is not a de Polignac number, because 28540965217 - 2²⁷ = 28406747489 is a prime.

It is not a weakly prime, because it can be changed into another prime (28540962217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14270482608 + 14270482609.

It is an arithmetic number, because the mean of its divisors is an integer number (14270482609).

Almost surely, 2^28540965217 is an apocalyptic number.

It is an amenable number.

28540965217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28540965217 is an equidigital number, since it uses as much as digits as its factorization.

28540965217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 28540965217 in words is "twenty-eight billion, five hundred forty million, nine hundred sixty-five thousand, two hundred seventeen".