The winning numbers in the Wednesday night drawing were 6, 27, 46, 51, 56 and Powerball 21.
The Michigan Lottery says the ticket was sold in Lapeer, about 45 miles north of Detroit. There wasn't immediate word about the buyer's identity.
A person who answered the phone Thursday morning at the Sunoco station said he was too busy to talk.
Eight tickets matched five of the winning numbers to win $1 million. Two of those tickets were sold in Indiana. The others were sold in Kansas, Kentucky, New Jersey, New Mexico, Pennsylvania and Virginia.
There was also a ticket sold in Nebraska that added the Power Play to win $2 million.