The "500th number" refers to the integer that holds the position of five hundred in a sequential list of whole numbers. In mathematics, this is simply the number 500 itself, which is an even number and can be divided by 2 without a remainder. In various contexts, the 500th number can represent milestones, such as the 500th page in a book or the 500th item in a collection. It can also be significant in statistics, where it might denote the 500th data point in a dataset, impacting analysis and conclusions drawn from that data.