28185055 has 4 divisors (see below), whose sum is σ = 33822072. Its totient is φ = 22548040.

The previous prime is 28185019. The next prime is 28185061. The reversal of 28185055 is 55058182.

It is a happy number.

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

It is not a de Polignac number, because 28185055 - 2¹⁵ = 28152287 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 28185055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2818501 + ... + 2818510.

It is an arithmetic number, because the mean of its divisors is an integer number (8455518).

Almost surely, 2^28185055 is an apocalyptic number.

28185055 is a deficient number, since it is larger than the sum of its proper divisors (5637017).

28185055 is an equidigital number, since it uses as much as digits as its factorization.

28185055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5637016.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 28185055 is about 5308.9598792984. The cubic root of 28185055 is about 304.3264002027.

The spelling of 28185055 in words is "twenty-eight million, one hundred eighty-five thousand, fifty-five".