Il numero romano MMMDCLXXX nel sistema decimale vale: 3680.
MMMDCLXXX in latino si scrive tria milia sescenti octoginta,
mentre in italiano tremilaseicentottanta.
MMMDCLXI, MMMDCLXII, MMMDCLXIII, MMMDCLXIV, MMMDCLXV, MMMDCLXVI, MMMDCLXVII, MMMDCLXVIII, MMMDCLXIX, MMMDCLXX, MMMDCLXXI, MMMDCLXXII, MMMDCLXXIII, MMMDCLXXIV, MMMDCLXXV, MMMDCLXXVI, MMMDCLXXVII, MMMDCLXXVIII, MMMDCLXXIX, MMMDCLXXXI, MMMDCLXXXII, MMMDCLXXXIII, MMMDCLXXXIV, MMMDCLXXXV, MMMDCLXXXVI, MMMDCLXXXVII, MMMDCLXXXVIII, MMMDCLXXXIX, MMMDCXC, MMMDCXCI, MMMDCXCII, MMMDCXCIII, MMMDCXCIV, MMMDCXCV, MMMDCXCVI, MMMDCXCVII, MMMDCXCVIII, MMMDCXCIX