28090555 has 4 divisors (see below), whose sum is σ = 33708672. Its totient is φ = 22472440.

The previous prime is 28090541. The next prime is 28090577. The reversal of 28090555 is 55509082.

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

It is not a de Polignac number, because 28090555 - 2¹¹ = 28088507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28090555.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2809051 + ... + 2809060.

It is an arithmetic number, because the mean of its divisors is an integer number (8427168).

Almost surely, 2^28090555 is an apocalyptic number.

28090555 is a deficient number, since it is larger than the sum of its proper divisors (5618117).

28090555 is an equidigital number, since it uses as much as digits as its factorization.

28090555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5618116.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 28090555 is about 5300.0523582319. The cubic root of 28090555 is about 303.9859000559.

The spelling of 28090555 in words is "twenty-eight million, ninety thousand, five hundred fifty-five".