I've just learned a new formal word 余 and I'm trying to understand it's placement. I know that roughly it means 多 but in a more formal way. If for example, I was saying "more than 500 people" I think I could say both
五百多人, and 五百人多 (correct me if I'm wrong on this one)
However, could I say
五百余人? 五百人余?