28089539 has 2 divisors, whose sum is σ = 28089540. Its totient is φ = 28089538.

The previous prime is 28089527. The next prime is 28089547. The reversal of 28089539 is 93598082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28089539 - 2¹² = 28085443 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28089539.

It is not a weakly prime, because it can be changed into another prime (28089569) 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, 14044769 + 14044770.

It is an arithmetic number, because the mean of its divisors is an integer number (14044770).

Almost surely, 2^28089539 is an apocalyptic number.

28089539 is a deficient number, since it is larger than the sum of its proper divisors (1).

28089539 is an equidigital number, since it uses as much as digits as its factorization.

28089539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 28089539 is about 5299.9565092555. The cubic root of 28089539 is about 303.9822350826.

The spelling of 28089539 in words is "twenty-eight million, eighty-nine thousand, five hundred thirty-nine".