28091616269 has 2 divisors, whose sum is σ = 28091616270. Its totient is φ = 28091616268.

The previous prime is 28091616233. The next prime is 28091616331. The reversal of 28091616269 is 96261619082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19870567369 + 8221048900 = 140963^2 + 90670^2 .

It is a cyclic number.

It is not a de Polignac number, because 28091616269 - 2²⁰ = 28090567693 is a prime.

It is a super-2 number, since 2×28091616269² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28091216269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14045808134 + 14045808135.

It is an arithmetic number, because the mean of its divisors is an integer number (14045808135).

Almost surely, 2^28091616269 is an apocalyptic number.

It is an amenable number.

28091616269 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091616269 is an equidigital number, since it uses as much as digits as its factorization.

28091616269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 28091616269 in words is "twenty-eight billion, ninety-one million, six hundred sixteen thousand, two hundred sixty-nine".