If I had such a big sum of money, I would repay all my debts first (I borrowed money from my friends and had to get cash advance online as I lost my job). Then I would go on vacation with my family. Maybe I'd spend some money on home renovation.
I forgot about this because I don't have debt to anyone.
But it's a good decision to do this first so that you can breathe well with your expenses. Most of the financial literacy teachers that I've heard, they're all telling this.
Paying off debts will allow you to move further so you won't be thinking of any burden that you have missed just like debt.