28091715797 has 2 divisors, whose sum is σ = 28091715798. Its totient is φ = 28091715796.

The previous prime is 28091715779. The next prime is 28091715857. The reversal of 28091715797 is 79751719082.

It is a happy number.

Together with previous prime (28091715779) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25444716196 + 2646999601 = 159514^2 + 51449^2 .

It is a cyclic number.

It is not a de Polignac number, because 28091715797 - 2⁶ = 28091715733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28091715097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045857898 + 14045857899.

It is an arithmetic number, because the mean of its divisors is an integer number (14045857899).

Almost surely, 2^28091715797 is an apocalyptic number.

It is an amenable number.

28091715797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091715797 is an equidigital number, since it uses as much as digits as its factorization.

28091715797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 56.

The spelling of 28091715797 in words is "twenty-eight billion, ninety-one million, seven hundred fifteen thousand, seven hundred ninety-seven".