28320788669 has 2 divisors, whose sum is σ = 28320788670. Its totient is φ = 28320788668.

The previous prime is 28320788647. The next prime is 28320788693. The reversal of 28320788669 is 96688702382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24535463044 + 3785325625 = 156638^2 + 61525^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320788669 - 2¹² = 28320784573 is a prime.

It is a super-2 number, since 2×28320788669² (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 (28320788369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160394334 + 14160394335.

It is an arithmetic number, because the mean of its divisors is an integer number (14160394335).

Almost surely, 2^28320788669 is an apocalyptic number.

It is an amenable number.

28320788669 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320788669 is an equidigital number, since it uses as much as digits as its factorization.

28320788669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13934592, while the sum is 59.

The spelling of 28320788669 in words is "twenty-eight billion, three hundred twenty million, seven hundred eighty-eight thousand, six hundred sixty-nine".