28512790669217 has 2 divisors, whose sum is σ = 28512790669218. Its totient is φ = 28512790669216.

The previous prime is 28512790669183. The next prime is 28512790669249. The reversal of 28512790669217 is 71296609721582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28506159661456 + 6631007761 = 5339116^2 + 81431^2 .

It is a cyclic number.

It is not a de Polignac number, because 28512790669217 - 2⁸ = 28512790668961 is a prime.

It is a super-2 number, since 2×28512790669217² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28512790669117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14256395334608 + 14256395334609.

It is an arithmetic number, because the mean of its divisors is an integer number (14256395334609).

Almost surely, 2^{28512790669217} is an apocalyptic number.

It is an amenable number.

28512790669217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28512790669217 is an equidigital number, since it uses as much as digits as its factorization.

28512790669217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 65.

The spelling of 28512790669217 in words is "twenty-eight trillion, five hundred twelve billion, seven hundred ninety million, six hundred sixty-nine thousand, two hundred seventeen".