28145589 has 4 divisors (see below), whose sum is σ = 37527456. Its totient is φ = 18763724.

The previous prime is 28145581. The next prime is 28145599. The reversal of 28145589 is 98554182.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28145589 - 2³ = 28145581 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28145589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145581) 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 3 ways as a sum of consecutive naturals, for example, 4690929 + ... + 4690934.

It is an arithmetic number, because the mean of its divisors is an integer number (9381864).

Almost surely, 2^28145589 is an apocalyptic number.

It is an amenable number.

28145589 is a deficient number, since it is larger than the sum of its proper divisors (9381867).

28145589 is an equidigital number, since it uses as much as digits as its factorization.

28145589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9381866.

The product of its digits is 115200, while the sum is 42.

The square root of 28145589 is about 5305.2416533085. The cubic root of 28145589 is about 304.1842899486.

The spelling of 28145589 in words is "twenty-eight million, one hundred forty-five thousand, five hundred eighty-nine".