Not only do you have to be the only winner (the hitman budget necessary to accomplish that would be astronomical), but your after-tax haul would only be a little over $600,000, so even if you were the sole winner you’d still lose money.
Your tax calculation is wrong.
$1.6 million X 0.63 = $1,008,000
No state taxes in WA.
Only the 37% top federal rate applies.
Don’t forget you get to deduct the cost of the $851,000 in ticket cost...