There are quite a few other techniques to invest half a million dollars that could be a lot more profitable and offer additional liquidity.
Colorado Lottery

Lotteries do not get in touch with prize winners by means of Facebook, unless you especially entered an official lottery promotion or contest,” the lotterywebsite says.
Tickets worth a million dollars and $50,000 had been sold in the state.
Powerball tickets are $2 per play, and tickets are sold in 45 states, the District of Columbia, Puerto Rico and the U.S.