At first I too thought that it was about the amount of set Playmobil has made. Later realizing that at least 1 zero has to be added.
It also made me wonder how many set's I've got. And maybe I'm missing 1 or 2, my total comes to 427 (including ds Add ons etc.) I don't have it on paper, but use excell and it also includes a list of parts which I want to order, a list of sets I still want.