I disagree; what's easier, spotting the biggest and smallest of these at a glance:
6,677,967
5,916,109
7,164,551
3,745,059,597
3,175
4,194,304
3,550,137
or these: 6.37M
5.64M
6.83M
3.49G
3.10k
4.00M
3.39M
If they differ by orders of magnitude, then the difference is visually obvious when the full digits are printed out --- sticking out like the proverbial sore thumb. If they're compressed into units, you have to do some more mental multiplication and comparison.