'Twenty eight' in the Bible

The length of a curtain shall be twenty eight cubits, and the breadth four and they shall be all of one measure:

The length of one curtain was twenty eight cubits, and the breadth four, and were all of one size.

And the time that Jehu reigned upon Israel in Samaria, was twenty eight years.

And of Dan prepared to battle, were twenty eight thousand and six hundred.

But Rehoboam loved Maacah the daughter of Absalom above all his wives and concubines for he took eighteen wives and three score concubines, and begat three score daughters and twenty eight sons.