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
XIII.
47
400 = CD
146
DCCCLXXXVIII
It is: 1066 = MLXVI
It is: 261 = CCLXI
70 = LXX