The prize was shared by two individuals, who agreed to split the prize if won - and they stayed true to their word.
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The winners wish to remain anonymous.
MORE: What are the odds of winning the Mega Millions lottery jackpot?
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The ticket was purchased at the Speedway #4250 on Touhy Avenue in Des Plaines at the end of July, according to lottery officials.
It was the third largest jackpot in U.S. history.
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The winners have spent the past few weeks working with professional legal and financial advisors to support the claim process, and have opted to take the lump sum payment of $780.5 million.
LIST: 10 biggest Mega Millions, Powerball jackpots won in US lottery history
The Mega Millions jackpot roll started on April 16 until July 29, and the state of Illinois was also a big winner.
During the jackpot roll, the Illinois Lottery generated $34 million for the Common School Fund through the sale of the game.
Retailers earned $3.75 million in payable commission and bonuses for selling winning tickets, and in total there were more than 1.4 million winning tickets in Illinois collecting $11.8 million in prizes (excluding the jackpot), including four individuals who won prizes of $1 million.
"It's definitely the largest jackpot Illinois has seen -- third largest of all time in the U.S," Illinois Lottery Director Harold Mays said.
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