Have you ever checked exported png image's dimension?
Does your Illustrator file crashes while exporting large files?
Illustrator exporting images in some weird number resolution (don't know why). So I found the proper way to export artboards.
Photoshop and Illustrator both calculating DPI differently from each other. In photoshop, 100x100 px @300dpi Image will get exported same resolution of 100x100. But In Illustrator 100x100 px image @300 dpi will make resolution way too much larger. You will better understand if you try practically.
I hope you'll learn something out of it. :)
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