28336656281 has 2 divisors, whose sum is σ = 28336656282. Its totient is φ = 28336656280.

The previous prime is 28336656191. The next prime is 28336656317. The reversal of 28336656281 is 18265663382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27561312256 + 775344025 = 166016^2 + 27845^2 .

It is a cyclic number.

It is not a de Polignac number, because 28336656281 - 2¹⁰ = 28336655257 is a prime.

It is a super-2 number, since 2×28336656281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28336656181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14168328140 + 14168328141.

It is an arithmetic number, because the mean of its divisors is an integer number (14168328141).

Almost surely, 2^28336656281 is an apocalyptic number.

It is an amenable number.

28336656281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28336656281 is an equidigital number, since it uses as much as digits as its factorization.

28336656281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 50.

The spelling of 28336656281 in words is "twenty-eight billion, three hundred thirty-six million, six hundred fifty-six thousand, two hundred eighty-one".