Call a crazy push with AK late in a ps180?

[fs3142]

20 players left in a $22 180 tourney on Pokerstars. I have AKo in the BB. Blinds are 300/600, I have 13500, button has about 14500. Everyone folds to the button, who open pushes for 24X the BB. BB hasn't pushed once in the 20 or so minutes I've been at his table, no maniac behavior or anything. So, do you call this ridiculous bet for all your chips or just fold?