28517752391 has 2 divisors, whose sum is σ = 28517752392. Its totient is φ = 28517752390.

The previous prime is 28517752379. The next prime is 28517752397. The reversal of 28517752391 is 19325771582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28517752391 - 2¹⁴ = 28517736007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28517752397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14258876195 + 14258876196.

It is an arithmetic number, because the mean of its divisors is an integer number (14258876196).

Almost surely, 2^28517752391 is an apocalyptic number.

28517752391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28517752391 is an equidigital number, since it uses as much as digits as its factorization.

28517752391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 50.

The spelling of 28517752391 in words is "twenty-eight billion, five hundred seventeen million, seven hundred fifty-two thousand, three hundred ninety-one".