28568716109 has 2 divisors, whose sum is σ = 28568716110. Its totient is φ = 28568716108.

The previous prime is 28568716079. The next prime is 28568716171. The reversal of 28568716109 is 90161786582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15907515625 + 12661200484 = 126125^2 + 112522^2 .

It is a cyclic number.

It is not a de Polignac number, because 28568716109 - 2⁸ = 28568715853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28568416109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14284358054 + 14284358055.

It is an arithmetic number, because the mean of its divisors is an integer number (14284358055).

Almost surely, 2^28568716109 is an apocalyptic number.

It is an amenable number.

28568716109 is a deficient number, since it is larger than the sum of its proper divisors (1).

28568716109 is an equidigital number, since it uses as much as digits as its factorization.

28568716109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 28568716109 in words is "twenty-eight billion, five hundred sixty-eight million, seven hundred sixteen thousand, one hundred nine".