28 (spelled twenty-eight) is a composite number that is 8 plus 20 more. Its factors are 2, 4, 7, and 14.
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In Elmo's World: Balls, Elmo asks the viewers to help him count how many times a CGI ball will bounce all over the screen. It bounces 28 times, which makes it the episode highest number in Elmo's Question.
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In Blueelephant7 (Gabe Sotillo)'s Number Creatures, number 28 is a duck and a bear.
In Ethecoolguy's Exotic Number Creatures, number 28 is a violin.