In Germany we don't use the apostrophe as a digit group separator. Instead, we use a small space, like so:
1 234 567
Edit: others suggest that a dot is used as group separator and it is sometimes seen. I believe that it is a more recent development, adding _even more_ confusion, if that is possible. DIN 1333 actively suggests _not_ to use a dot as group separator (WP: https://de.wikipedia.org/wiki/Schreibweise_von_Zahlen#Deutsc...)
(Periods like in this sentence from a front page article on ZEIT online: "Dafür erhält GM weitere 900 Millionen Euro, so dass sich ein Gesamtvolumen von 2,2 Milliarden Euro ergibt. Betroffen sind rund 40.000 Angestellte in zwölf Fabriken.")
Edit:
>I believe that it is a more recent development, adding _even more_ confusion, if that is possible.
Interesting. Using spaces in handwriting is more confusing though. We never used spaces on blackboards in school (at least in the 90s).
1 234 567
Edit: others suggest that a dot is used as group separator and it is sometimes seen. I believe that it is a more recent development, adding _even more_ confusion, if that is possible. DIN 1333 actively suggests _not_ to use a dot as group separator (WP: https://de.wikipedia.org/wiki/Schreibweise_von_Zahlen#Deutsc...)