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And in further explanation to what AnemicOak said, they represent "virtual" page numbers which are, roughly speaking, based on 1024 characters. I say roughly speaking because apparently it is technically more complex than this due to compression and other factors. Those numbers will be in the same place on any given reader (although apparently they can vary slightly between brands due to factors mentioned above) so even at different font sizes you can find the same point. It is also why on some readers depending on font size you may change several screen pages before the page number if displayed at the bottom of a page changes. Some readers may use the number of screen pages as the page number but increasing or decreasing the font size changes the number of pages and what page number a passage may appear on.
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