How many numbers can a person remember?

Answer 1

As many as they want. Keep in mind, a video camera records at a rate of at least a megabyte per second, and it records at a very poor resolution. Therefore, the human brain can recall memories (pictures containing several megabytes of data each) spanning several decades. There is no practical limit, given this sort of capability, of storing short, generally useful numbers. Don't be afraid to cram a bunch of useless trivia into your head because of the fear that it will become "too full". Rather, be concerned that you are periodically storing FALSE information, (which will happen anyway), and attempt to reduce the amount of FALSE information that will interfere with your reasoning capabilities later on. Realizing that information that you once believed to be true was in fact actually false, will restore your reasoning capability by at least a little bit.