28088168253781 has 2 divisors, whose sum is σ = 28088168253782. Its totient is φ = 28088168253780.

The previous prime is 28088168253779. The next prime is 28088168253793. The reversal of 28088168253781 is 18735286188082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22620011602500 + 5468156651281 = 4756050^2 + 2338409^2 .

It is a cyclic number.

It is not a de Polignac number, because 28088168253781 - 2¹ = 28088168253779 is a prime.

It is a super-3 number, since 3×28088168253781³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 28088168253779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28088168256781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14044084126890 + 14044084126891.

It is an arithmetic number, because the mean of its divisors is an integer number (14044084126891).

Almost surely, 2^{28088168253781} is an apocalyptic number.

It is an amenable number.

28088168253781 is a deficient number, since it is larger than the sum of its proper divisors (1).

28088168253781 is an equidigital number, since it uses as much as digits as its factorization.

28088168253781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82575360, while the sum is 67.

The spelling of 28088168253781 in words is "twenty-eight trillion, eighty-eight billion, one hundred sixty-eight million, two hundred fifty-three thousand, seven hundred eighty-one".