When we read comments or articles on a website, we see most of them being longer than 500 words. This is because there is a common misconception that for a page to rank, its content should be at least 500 in words. This is not true.
RANKING depends on a lot of factors. And even if more words will help Google understand what your page is about, the fact is that it will not assure you that your page will indeed rank. Though Google will more likely favor a longer article, it can also take notice of the shorter ones.