Английская Википедия:228 (number)
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228 (two hundred [and] twenty-eight) is the natural number following 227 and preceding 229.
In mathematics
228 is a refactorable number[1] and a practical number.[2] There are 228 matchings in a ladder graph with five rungs.[3] 228 is the smallest even number n such that the numerator of the nth Bernoulli number is divisible by a nontrivial square number that is relatively prime to n.[4]
The binary form of 228 contains all the two digit binary numbers in sequence from highest to lowest (11 10 01 00).
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