28559109 has 8 divisors (see below), whose sum is σ = 40083040. Its totient is φ = 18037296.

The previous prime is 28559081. The next prime is 28559129. The reversal of 28559109 is 90195582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28559109 - 2⁸ = 28558853 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 (28559129) 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 in 7 ways as a sum of consecutive naturals, for example, 250462 + ... + 250575.

It is an arithmetic number, because the mean of its divisors is an integer number (5010380).

Almost surely, 2^28559109 is an apocalyptic number.

It is an amenable number.

28559109 is a deficient number, since it is larger than the sum of its proper divisors (11523931).

28559109 is a wasteful number, since it uses less digits than its factorization.

28559109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501059.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 28559109 is about 5344.0723236124. The cubic root of 28559109 is about 305.6667631254. Note that the first 3 decimals are identical.

The spelling of 28559109 in words is "twenty-eight million, five hundred fifty-nine thousand, one hundred nine".