28338565691 has 2 divisors, whose sum is σ = 28338565692. Its totient is φ = 28338565690.

The previous prime is 28338565657. The next prime is 28338565693. The reversal of 28338565691 is 19656583382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28338565691 - 2²⁶ = 28271456827 is a prime.

It is a Sophie Germain prime.

Together with 28338565693, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28338565693) 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, 14169282845 + 14169282846.

It is an arithmetic number, because the mean of its divisors is an integer number (14169282846).

Almost surely, 2^28338565691 is an apocalyptic number.

28338565691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28338565691 is an equidigital number, since it uses as much as digits as its factorization.

28338565691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9331200, while the sum is 56.

The spelling of 28338565691 in words is "twenty-eight billion, three hundred thirty-eight million, five hundred sixty-five thousand, six hundred ninety-one".