28869089 has 2 divisors, whose sum is σ = 28869090. Its totient is φ = 28869088.

The previous prime is 28869073. The next prime is 28869101. The reversal of 28869089 is 98096882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25000000 + 3869089 = 5000^2 + 1967^2 .

It is a cyclic number.

It is not a de Polignac number, because 28869089 - 2⁴ = 28869073 is a prime.

It is not a weakly prime, because it can be changed into another prime (28869059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14434544 + 14434545.

It is an arithmetic number, because the mean of its divisors is an integer number (14434545).

Almost surely, 2^28869089 is an apocalyptic number.

It is an amenable number.

28869089 is a deficient number, since it is larger than the sum of its proper divisors (1).

28869089 is an equidigital number, since it uses as much as digits as its factorization.

28869089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 28869089 is about 5372.9962776834. The cubic root of 28869089 is about 306.7686862577.

The spelling of 28869089 in words is "twenty-eight million, eight hundred sixty-nine thousand, eighty-nine".