28128759 has 16 divisors (see below), whose sum is σ = 39617280. Its totient is φ = 17752536.

The previous prime is 28128719. The next prime is 28128787. The reversal of 28128759 is 95782182.

It is not a de Polignac number, because 28128759 - 2¹⁹ = 27604471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28128759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28128719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19894 + ... + 21260.

It is an arithmetic number, because the mean of its divisors is an integer number (2476080).

Almost surely, 2^28128759 is an apocalyptic number.

28128759 is a deficient number, since it is larger than the sum of its proper divisors (11488521).

28128759 is an equidigital number, since it uses as much as digits as its factorization.

28128759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427 (or 1389 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 28128759 is about 5303.6552489769. The cubic root of 28128759 is about 304.1236476180.

The spelling of 28128759 in words is "twenty-eight million, one hundred twenty-eight thousand, seven hundred fifty-nine".