28105855 has 8 divisors (see below), whose sum is σ = 33767712. Its totient is φ = 22457568.

The previous prime is 28105853. The next prime is 28105867. The reversal of 28105855 is 55850182.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28105855 - 2¹ = 28105853 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 28105855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28105853) 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 7 ways as a sum of consecutive naturals, for example, 1929 + ... + 7741.

It is an arithmetic number, because the mean of its divisors is an integer number (4220964).

Almost surely, 2^28105855 is an apocalyptic number.

28105855 is a deficient number, since it is larger than the sum of its proper divisors (5661857).

28105855 is an equidigital number, since it uses as much as digits as its factorization.

28105855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6785.

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

The square root of 28105855 is about 5301.4955437122. The cubic root of 28105855 is about 304.0410804076.

The spelling of 28105855 in words is "twenty-eight million, one hundred five thousand, eight hundred fifty-five".