CCCLXXVIII

CCCLXXVIII is the Roman numeral representing the integer 378. It is written by combining the symbols C (100) three times to make 300, LXX for 70, and VIII for 8, yielding the single numeral CCCLXXVIII. The notation uses the additive principle, with no subtractive pairs such as IV or XL in this form.

Roman numerals originated in ancient Rome and were used throughout antiquity and the Middle Ages, continuing in some contexts today for stylistic or traditional purposes. They appear on clock faces, in chapter or section headings, on monuments, and in the naming of monarchs or events. CCCLXXVIII, like other numbers in the 300s, is formed by adding hundreds, tens, and units without subtractive notation.

Numerically, 378 is an even composite number. Its prime factorization is 2 × 3^3 × 7 (378 = 2 × 27 × 7). It lies between 377 (CCCLXXVII) and 379 (CCCLXXIX) in the natural-number sequence. In the context of Roman numerals, CCCLXXVIII illustrates a typical construction for a number in the 300s using additive notation.