I thought I saw something like 5000 pixels on one side but I can't find it now There seems to be a problem with the uploader - it keeps telling me "The gallery only accepts photos at this time" but I'm trying to upload a 3000x2000 jpeg.
The "Internet" doesn't have, and can't have, a dots per inch (dpi).
It doesn't have a set pixels per inch (ppi) either.
For digital photographs the pixels per inch (ppi), or print resolution, only applies when a print is made.
In other words ppi is meaningless, and has zero effect, when a digital photo is displayed electronically.