28110891 has 8 divisors (see below), whose sum is σ = 37867984. Its totient is φ = 18547200.

The previous prime is 28110881. The next prime is 28110919. The reversal of 28110891 is 19801182.

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

It is not a de Polignac number, because 28110891 - 2⁶ = 28110827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28110881) 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, 48010 + ... + 48591.

It is an arithmetic number, because the mean of its divisors is an integer number (4733498).

Almost surely, 2^28110891 is an apocalyptic number.

28110891 is a deficient number, since it is larger than the sum of its proper divisors (9757093).

28110891 is an equidigital number, since it uses as much as digits as its factorization.

28110891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96701.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 28110891 is about 5301.9704827545. The cubic root of 28110891 is about 304.0592386578.

The spelling of 28110891 in words is "twenty-eight million, one hundred ten thousand, eight hundred ninety-one".