Photo resolution

Does anyone know what resolution or dpi P5 resizes the original photo to for sale? I imagine most of us are submitting full sized 300dpi. P5 then downsizes to several or many different sizes and give them all cute names. It shows the "inch" size but not dpi for each size.
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P5 can ya give a little more info on the photo downsize procedure and specs please. Thanks.

On my photographs I can read the following sizes:
blog 875x582
web 1751x1165
print 2627x1748
ultrahigh 3502x2331
megahigh 4378x2914
ultrahighxl 5254x3497
whopper 6130x4080

Surely they are pixels, not inches. Dpi is meaningless in this case.

The reason I posted this question is somewhere here on P5 I saw inch sizes and not pixel sizes. Maybe it was one particular photo and not the standard. I cannot find where I saw the inch measurement now.

"mouse-over" the circular Info icon next to the price and you will see the "inch" size.