Since then, there have been 28 straight drawings without a jackpot winner. Advertisement The jackpot is now theeighth-largest everin the U.S.It comes a little over a week aftersomeone in Los Angeleswon a$ 1.08 billion Powerball prize that ranked as the sixth-largest in U.S. history.... It’s still a mystery who won that prize. Lottery jackpots grow so large because the odds of winning are so small.... For Mega Millions, the odds of winning the jackpot are about1 in 302.6 million. Advertisement