28306209817 has 2 divisors, whose sum is σ = 28306209818. Its totient is φ = 28306209816.

The previous prime is 28306209769. The next prime is 28306209851. The reversal of 28306209817 is 71890260382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19940546521 + 8365663296 = 141211^2 + 91464^2 .

It is a cyclic number.

It is not a de Polignac number, because 28306209817 - 2⁷ = 28306209689 is a prime.

It is not a weakly prime, because it can be changed into another prime (28306209857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153104908 + 14153104909.

It is an arithmetic number, because the mean of its divisors is an integer number (14153104909).

Almost surely, 2^28306209817 is an apocalyptic number.

It is an amenable number.

28306209817 is a deficient number, since it is larger than the sum of its proper divisors (1).

28306209817 is an equidigital number, since it uses as much as digits as its factorization.

28306209817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 28306209817 in words is "twenty-eight billion, three hundred six million, two hundred nine thousand, eight hundred seventeen".