28643569189 has 2 divisors, whose sum is σ = 28643569190. Its totient is φ = 28643569188.

The previous prime is 28643569159. The next prime is 28643569211. The reversal of 28643569189 is 98196534682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16580940289 + 12062628900 = 128767^2 + 109830^2 .

It is a cyclic number.

It is not a de Polignac number, because 28643569189 - 2³¹ = 26496085541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28643569159) 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, 14321784594 + 14321784595.

It is an arithmetic number, because the mean of its divisors is an integer number (14321784595).

Almost surely, 2^28643569189 is an apocalyptic number.

It is an amenable number.

28643569189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28643569189 is an equidigital number, since it uses as much as digits as its factorization.

28643569189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22394880, while the sum is 61.

The spelling of 28643569189 in words is "twenty-eight billion, six hundred forty-three million, five hundred sixty-nine thousand, one hundred eighty-nine".