Fatto generale: 28 is the number of Chinese constellations, "Xiu" or "mansions" (a literal translation), equivalent to the 12 western zodiac constellations.
Fatto matematico: 28 is not the aliquot sum of any number other than itself and is therefore not a component in an aliquot sequence.
Trivia: 28 is the number of a car formerly run in the NASCAR Sprint Cup Series by Yates Racing.
Data storica: January 28th is the day in 1724 that the Russian Academy of Sciences is founded in St. Petersburg by Peter the Great, and implemented by Senate decree.