28768189 has 2 divisors, whose sum is σ = 28768190. Its totient is φ = 28768188.

The previous prime is 28768169. The next prime is 28768213. The reversal of 28768189 is 98186782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28708164 + 60025 = 5358^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 28768189 - 2⁹ = 28767677 is a prime.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28768139) 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, 14384094 + 14384095.

It is an arithmetic number, because the mean of its divisors is an integer number (14384095).

Almost surely, 2^28768189 is an apocalyptic number.

It is an amenable number.

28768189 is a deficient number, since it is larger than the sum of its proper divisors (1).

28768189 is an equidigital number, since it uses as much as digits as its factorization.

28768189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 49.

The square root of 28768189 is about 5363.5985121931. The cubic root of 28768189 is about 306.4108745774.

The spelling of 28768189 in words is "twenty-eight million, seven hundred sixty-eight thousand, one hundred eighty-nine".