How many sperm are found in a single, typical ejaculate?
The normal count of sperm cell per milliliter of semen is over 15 million sperm as per the World Health Organization so that's around 75 million if the man ejaculates 5 mL of semen.
Sperm cells were made to be great in numbers to fertilize one egg cell because the woman's vagina is acidic which kills the sperm cell. In short, a man could ejaculate an entire country in one go. That ought to surprise anyone who hasn't studied anatomy and physiology.