28032559 has 4 divisors (see below), whose sum is σ = 28246680. Its totient is φ = 27818440.

The previous prime is 28032553. The next prime is 28032617. The reversal of 28032559 is 95523082.

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

It is a cyclic number.

It is not a de Polignac number, because 28032559 - 2³ = 28032551 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 (28032551) 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, 106864 + ... + 107125.

It is an arithmetic number, because the mean of its divisors is an integer number (7061670).

Almost surely, 2^28032559 is an apocalyptic number.

28032559 is a deficient number, since it is larger than the sum of its proper divisors (214121).

28032559 is a wasteful number, since it uses less digits than its factorization.

28032559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214120.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 28032559 is about 5294.5782646024. The cubic root of 28032559 is about 303.7765519531.

The spelling of 28032559 in words is "twenty-eight million, thirty-two thousand, five hundred fifty-nine".