It may just be the biggest lottery reward ever. The Mega Millions jackpot has grown to $640 million as the frenzy to buy tickets grew. Officials say that more than $1.4 billion in tickets were sold across 48 states and the District of Columbia. The odds of winning were about 1 in 176 million when the drawing took place Friday night. Some have dropped thousands of dollars on a chance to win the jackpot. If taken in a lump sum, the winner would get about $462 million, but after taxes that would amount to about $347 million.