<prompt>  Human: Dear PF community. A friend recommended that I ask reddit, as they have a very helpful community. I recently won the national lottery dont want to specify country for privacy reasons, but somewhere in Europe of about 1,5 million, which leaves me with 750.000 after taxes.Heres my situation:Im 25 and I have a masters degree in Civil engineering. Im currently working as an consulting engineer and doing some research at the University as prep for an industrial Ph.D.I live very frugally and i am paying mortgage off my apartment, which leaves me with a lot of savings every month. So basically my monthly expenses arent any problem. However, i dont really know anything about money except how to save and sometimes how to spend. Now that i have a large sum, what do i do with it? My intuition tells me to put it in the bank and pay off my apartment. Should i invest or is that risky with that large a sum? Do i have any other options? Any input would be appreciated.Thanks for listening guys. I hope my first visit to this site will be a good one. 