28568559 has 4 divisors (see below), whose sum is σ = 38091416. Its totient is φ = 19045704.

The previous prime is 28568543. The next prime is 28568563. The reversal of 28568559 is 95586582.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28568559 - 2⁴ = 28568543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28568159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4761424 + ... + 4761429.

It is an arithmetic number, because the mean of its divisors is an integer number (9522854).

Almost surely, 2^28568559 is an apocalyptic number.

28568559 is a deficient number, since it is larger than the sum of its proper divisors (9522857).

28568559 is an equidigital number, since it uses as much as digits as its factorization.

28568559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9522856.

The product of its digits is 864000, while the sum is 48.

The square root of 28568559 is about 5344.9564076800. The cubic root of 28568559 is about 305.7004737052.

The spelling of 28568559 in words is "twenty-eight million, five hundred sixty-eight thousand, five hundred fifty-nine".