Claude "Al" G. — who didn't want to reveal his full last name — said he purchased the winning ticket Saturday and learned he was the winner Sunday morning due to his wife Jackie's exclamations.
"Oh my God, oh my God, oh my God!" she screamed as she compared the numbers, The Denver Post reported.
"I have been waking up since Sunday feeling like this isn't really real," Al said.
The couple said they plan to immediately take a vacation, but beyond that they're not sure what they'll do with the money.
As of Wednesday, Al said he hadn't decided if he'll take the cash option or the long-term payout.
The winning numbers were 3-12-31-34-51 and the Powerball of 24.