28278228 has 48 divisors (see below), whose sum is σ = 73221120. Its totient is φ = 8421600.

The previous prime is 28278227. The next prime is 28278253. The reversal of 28278228 is 82287282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278227) 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 15 ways as a sum of consecutive naturals, for example, 5973 + ... + 9603.

It is an arithmetic number, because the mean of its divisors is an integer number (1525440).

Almost surely, 2^28278228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28278228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36610560).

28278228 is an abundant number, since it is smaller than the sum of its proper divisors (44942892).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28278228 is a wasteful number, since it uses less digits than its factorization.

28278228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3708 (or 3706 counting only the distinct ones).

The product of its digits is 57344, while the sum is 39.

The square root of 28278228 is about 5317.7277102161. The cubic root of 28278228 is about 304.6613746068.

The spelling of 28278228 in words is "twenty-eight million, two hundred seventy-eight thousand, two hundred twenty-eight".