Il numero romano MMCCCLXXVIII nel sistema decimale vale: 2378.
MMCCCLXXVIII in latino si scrive duo milia trecenti septuaginta octo,
mentre in italiano duemilatrecentosettantotto.
MMCCCLIX, MMCCCLX, MMCCCLXI, MMCCCLXII, MMCCCLXIII, MMCCCLXIV, MMCCCLXV, MMCCCLXVI, MMCCCLXVII, MMCCCLXVIII, MMCCCLXIX, MMCCCLXX, MMCCCLXXI, MMCCCLXXII, MMCCCLXXIII, MMCCCLXXIV, MMCCCLXXV, MMCCCLXXVI, MMCCCLXXVII, MMCCCLXXIX, MMCCCLXXX, MMCCCLXXXI, MMCCCLXXXII, MMCCCLXXXIII, MMCCCLXXXIV, MMCCCLXXXV, MMCCCLXXXVI, MMCCCLXXXVII, MMCCCLXXXVIII, MMCCCLXXXIX, MMCCCXC, MMCCCXCI, MMCCCXCII, MMCCCXCIII, MMCCCXCIV, MMCCCXCV, MMCCCXCVI, MMCCCXCVII