28056123517 has 2 divisors, whose sum is σ = 28056123518. Its totient is φ = 28056123516.

The previous prime is 28056123497. The next prime is 28056123569. The reversal of 28056123517 is 71532165082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20320217401 + 7735906116 = 142549^2 + 87954^2 .

It is a cyclic number.

It is not a de Polignac number, because 28056123517 - 2¹¹ = 28056121469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28056123517.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28056123217) 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 as a sum of consecutive naturals, namely, 14028061758 + 14028061759.

It is an arithmetic number, because the mean of its divisors is an integer number (14028061759).

Almost surely, 2^28056123517 is an apocalyptic number.

It is an amenable number.

28056123517 is a deficient number, since it is larger than the sum of its proper divisors (1).

28056123517 is an equidigital number, since it uses as much as digits as its factorization.

28056123517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

Adding to 28056123517 its reverse (71532165082), we get a palindrome (99588288599).

The spelling of 28056123517 in words is "twenty-eight billion, fifty-six million, one hundred twenty-three thousand, five hundred seventeen".