Depends on what you need it for. What you typically want is a base which is divisible lots of different ways (12 or 28 or 60 for example) or a prime base. Both have their advantages.
…its much shorter if you make use of our ability to merge words into one!
Fünfunddreizigtausendsechshundertachtundneunzig or try this one:
Rhabarbarbarasbarbarenbabierbar - Rhubarb-Barbara’s barbarian-barber bar
by the way the winner in terms of efficiency comes from Switzerland, Belgium and French Canada
1.trente-cinq-mille-six-cent-nonante-huit (Swiss,Belgian and French Canada French)
In light of the nature of this thread…
=> “French-speaking Belgians” (a.k.a Walloons)
(I wasn’t raised to say nonante)
Yes French-speaking Swiss, Belgians and Canadians would be better
Just so you know, in Québec (French-Canada) we’re using the French nomenclature (soixante-dix, quatre-vingt, quatre-vingt-dix). It’s only Belgium and it’s colonies and Switzerland that use septante, huitante and nonante.