MMMDVIII are the Roman numerals for 3528.
Improved Answer:
The above answer represents 3508 in Roman numerals whereas 3528 is actually MMMDXXVIII in Roman numerals.
XXI
LXXXI
MDCCCC.
CDLXXVIII
47
XIII.
146
It is: 1066 = MLXVI
DCCCLXXXVIII
400 = CD
70 = LXX
It is: 261 = CCLXI