28065889 has 2 divisors, whose sum is σ = 28065890. Its totient is φ = 28065888.

The previous prime is 28065847. The next prime is 28065913. The reversal of 28065889 is 98856082.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27878400 + 187489 = 5280^2 + 433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28065889 is a prime.

It is not a weakly prime, because it can be changed into another prime (28065809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14032944 + 14032945.

It is an arithmetic number, because the mean of its divisors is an integer number (14032945).

Almost surely, 2^28065889 is an apocalyptic number.

It is an amenable number.

28065889 is a deficient number, since it is larger than the sum of its proper divisors (1).

28065889 is an equidigital number, since it uses as much as digits as its factorization.

28065889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 276480, while the sum is 46.

The square root of 28065889 is about 5297.7248890444. The cubic root of 28065889 is about 303.8968984685.

The spelling of 28065889 in words is "twenty-eight million, sixty-five thousand, eight hundred eighty-nine".