Il numero romano MMDCLXXX nel sistema decimale vale: 2680.
MMDCLXXX in latino si scrive duo milia sescenti octoginta,
mentre in italiano duemilaseicentottanta.
MMDCLXI, MMDCLXII, MMDCLXIII, MMDCLXIV, MMDCLXV, MMDCLXVI, MMDCLXVII, MMDCLXVIII, MMDCLXIX, MMDCLXX, MMDCLXXI, MMDCLXXII, MMDCLXXIII, MMDCLXXIV, MMDCLXXV, MMDCLXXVI, MMDCLXXVII, MMDCLXXVIII, MMDCLXXIX, MMDCLXXXI, MMDCLXXXII, MMDCLXXXIII, MMDCLXXXIV, MMDCLXXXV, MMDCLXXXVI, MMDCLXXXVII, MMDCLXXXVIII, MMDCLXXXIX, MMDCXC, MMDCXCI, MMDCXCII, MMDCXCIII, MMDCXCIV, MMDCXCV, MMDCXCVI, MMDCXCVII, MMDCXCVIII, MMDCXCIX