28085489 has 2 divisors, whose sum is σ = 28085490. Its totient is φ = 28085488.

The previous prime is 28085459. The next prime is 28085521. The reversal of 28085489 is 98458082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23280625 + 4804864 = 4825^2 + 2192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28085489 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28085429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14042744 + 14042745.

It is an arithmetic number, because the mean of its divisors is an integer number (14042745).

Almost surely, 2^28085489 is an apocalyptic number.

It is an amenable number.

28085489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28085489 is an equidigital number, since it uses as much as digits as its factorization.

28085489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 44.

The square root of 28085489 is about 5299.5744168754. The cubic root of 28085489 is about 303.9676248129.

The spelling of 28085489 in words is "twenty-eight million, eighty-five thousand, four hundred eighty-nine".