It's really simple - 28x1-5/8x1-1/2" is the same size as 29" and 700C - they're all 622 mm on the bead seat.
Meanwhile 27" is larger than all of them, at 630 mm, except British 28x1-1/2" aka 700B which is 635 mm.
This is why the ISO standard (formerly ETRTO) is the only way to be sure that you get what you need: 25-622 is a road race tyre and 70-622 is a 29er tyre.
27-5 and 29er are both marketing terms for MTB wheels, 27-5 is actually the French size 650B while 29er is 700C so they're not new sizes just confusing names.
The British 28" was for traditional rod brake roadsters which are still common in India, the more common "English roadster" size is 26x1-3/8" which, it should be noted, is not the same as 26x1-1/4" or 26x1.25" or 26x1-1/2" or 26x1" or a different 26x1" ... just use the ISO size and avoid all this confusion.