Il numero romano MMMCLXXX nel sistema decimale vale: 3180.
MMMCLXXX in latino si scrive tria milia centum octoginta,
mentre in italiano tremilacentottanta.
MMMCLXI, MMMCLXII, MMMCLXIII, MMMCLXIV, MMMCLXV, MMMCLXVI, MMMCLXVII, MMMCLXVIII, MMMCLXIX, MMMCLXX, MMMCLXXI, MMMCLXXII, MMMCLXXIII, MMMCLXXIV, MMMCLXXV, MMMCLXXVI, MMMCLXXVII, MMMCLXXVIII, MMMCLXXIX, MMMCLXXXI, MMMCLXXXII, MMMCLXXXIII, MMMCLXXXIV, MMMCLXXXV, MMMCLXXXVI, MMMCLXXXVII, MMMCLXXXVIII, MMMCLXXXIX, MMMCXC, MMMCXCI, MMMCXCII, MMMCXCIII, MMMCXCIV, MMMCXCV, MMMCXCVI, MMMCXCVII, MMMCXCVIII, MMMCXCIX