28111844 has 6 divisors (see below), whose sum is σ = 49195734. Its totient is φ = 14055920.

The previous prime is 28111843. The next prime is 28111871. The reversal of 28111844 is 44811182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 9535744 = 4310^2 + 3088^2 .

It is not an unprimeable number, because it can be changed into a prime (28111841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3513977 + ... + 3513984.

It is an arithmetic number, because the mean of its divisors is an integer number (8199289).

Almost surely, 2^28111844 is an apocalyptic number.

It is an amenable number.

28111844 is a deficient number, since it is larger than the sum of its proper divisors (21083890).

28111844 is a wasteful number, since it uses less digits than its factorization.

28111844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7027965 (or 7027963 counting only the distinct ones).

The product of its digits is 2048, while the sum is 29.

The square root of 28111844 is about 5302.0603542397. The cubic root of 28111844 is about 304.0626746354.

The spelling of 28111844 in words is "twenty-eight million, one hundred eleven thousand, eight hundred forty-four".