28320641117 has 2 divisors, whose sum is σ = 28320641118. Its totient is φ = 28320641116.

The previous prime is 28320641081. The next prime is 28320641137. The reversal of 28320641117 is 71114602382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20088526756 + 8232114361 = 141734^2 + 90731^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320641117 - 2²⁸ = 28052205661 is a prime.

It is a super-2 number, since 2×28320641117² (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 (28320641137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160320558 + 14160320559.

It is an arithmetic number, because the mean of its divisors is an integer number (14160320559).

Almost surely, 2^28320641117 is an apocalyptic number.

It is an amenable number.

28320641117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320641117 is an equidigital number, since it uses as much as digits as its factorization.

28320641117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The spelling of 28320641117 in words is "twenty-eight billion, three hundred twenty million, six hundred forty-one thousand, one hundred seventeen".