You clowns on here ... all math class failures. Take a set at the poker table.
With the instant pay out option (almost every takes) -- you can half your winnings, then half them again for taxes. Even the 1.3 billion would be whittled down to about 350 million.
The current odds are 1 in 284 mill. That's $584 million for every combination; already a huge f'ing loss.
Even still; some egghead crunched the numbers and over a certain amount jackpot, say $500 billion, there's about a 10% chance of 0 winners, 10% chance of 1 winner, 20% chance of 2 winners, 20% chance of 3 winners ... and so on to about 6+ winners having about a 10% chance as well.
Ipso facto, you winning solo with a mega jackpot and a fck-ton of people playing are not great.
The EV is definitely negative. Not to mention, you have a better chance of getting a blow-jay by Emma Watson after winning the Boston Marathon this year (and then predicting 3 consecutive coin tosses) than to come close to winning the PowerBall, but people are idiots.