What is the roman numeral for 5900000000?

Answer 1

((D))M(CM)M = 5,900,000,000 in Roman numerals which is 5.9*109 in scientific notation

Numerals in double brackets indicate multiplication by ten thousand, numerals in single brackets indicate multiplication by a thousand and superscript numerals indicate multiplication by that particular numeral.

Hence:

((D))M = 10,000*500*1,000 = 5,000,000,000

(CM)M = 1,000*900*1,000 = 900,000,000

In reality such a large number would have probably been rounded off to the nearest billion which in this case works out as ((DC))M