28444589 has 2 divisors, whose sum is σ = 28444590. Its totient is φ = 28444588.

The previous prime is 28444573. The next prime is 28444597. The reversal of 28444589 is 98544482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 195364 = 5315^2 + 442^2 .

It is a cyclic number.

It is not a de Polignac number, because 28444589 - 2⁴ = 28444573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28444189) 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, 14222294 + 14222295.

It is an arithmetic number, because the mean of its divisors is an integer number (14222295).

Almost surely, 2^28444589 is an apocalyptic number.

It is an amenable number.

28444589 is a deficient number, since it is larger than the sum of its proper divisors (1).

28444589 is an equidigital number, since it uses as much as digits as its factorization.

28444589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 368640, while the sum is 44.

The square root of 28444589 is about 5333.3468853994. The cubic root of 28444589 is about 305.2576484554.

The spelling of 28444589 in words is "twenty-eight million, four hundred forty-four thousand, five hundred eighty-nine".