How would you say "There are 7 billion people in the world." (US/UK short scale) or "There are 7 thousand million people in the world." (European long scale), in both Esperanto and Ido?

I think in Esperanto it's supposed to be "Estas sep miliardoj da homoj en la mondo." In other words, words like "miliono", "miliardo", "biliono", "biliardo" are collective nouns that require the preposition "da". Contrast this with all numbers less than a million, which are cardinal adjectives not requiring "da" and admitting to agglutination rules. For instance, you can say "Estas sepmil homoj en tiu vilagxo." I'm pretty sure all of that's correct, but do I have it right?

In Ido, I'm not so sure, because I can't find any actual usage examples. Dictionaries show them as "miliono", etc., but the original manual by Beaufront listed them with the other roots as "milion", "bilion", etc. That seems to imply that you should be able to use the same combining rules as for smaller numbers. So just as you can say "Esas sepamil homi en ta vilajo", you should be able to say "Esas sepamiliard homi en la mondo". But is it supposed to be "Esas sep miliardi de homi en la mondo" instead?

I don't know anythig about Ido.
About numbers in Esperanto read this

sergejm:I don't know anythig about Ido.
About numbers in Esperanto read this

"There are 7 thousand million people in the world." (European long scale),

Europeans have a different approach to that "thousand million". We say "There are 7 milliard people in the world." (European long scale),

US/UK Billion is Milliard in the long scale, Trillion in SC is Billion in LS etc. That is why large numbers are frequently incorrectly translated from the English language into continental European languages.

See http://en.wikipedia.org/wiki/Long_and_short_scales

Peter

This is my guess:
Estas sep miliardoj da homoj en la mondo.


From the Tekstaro:
...ĉirkaŭ tri miliardojn da kubaj metroj...
...tutaj milionoj kaj miliardoj da aliaj similaj...
...la plenan miliardon da pasaĝeroj...
...sed pluraj miliardoj da homoj...
...Dum la lastaj jardekoj miliardoj da dolaroj...