There are only 175.2m possible lottery ticket combinations in the CA Powerball. At $2 a ticket, it costs $350.4m to guarantee a win. The current grand prize is $700m. If it were not for taxes and other deductions, it would be economically responsible to spend $350,400,000 on lottery tickets.

On an unrelated note, can I borrow like.... $350m from someone? Promise to pay you back.