Currently, public sub counts are abbreviated in most but not all places across YouTube. In August, we’ll make this more consistent by always showing abbreviated sub counts publicly. Creators: You’ll still see your full sub count in Studio! Learn more → http://yt.be/help/abbrev-count …pic.twitter.com/pmaKk4EU4k
Why not do your abbreviation since you're stuck on it, but if people want to see the entire number then they click or tap on the sub count? And maybe don't give only abbreviated numbers to third parties?!? Let them have access to the whole thing.