LXXIX

LXXIX is the Roman numeral for the number 79. In the Roman numeral system, L represents 50, XX represents 20, and IX represents 9, so LXXIX equals 50 + 20 + 9 = 79. The notation uses subtractive IX for nine and additive sequences for the other parts, reflecting common conventions of Roman numerals.

LXXIX appears in contexts where Roman numerals are used to denote numbers, such as dates, chapter or section numbering, and various lists or designs. For example, a year written as LXXIX would correspond to 79 CE (or 79 AD). In modern usage, Roman numerals are often employed for stylistic or traditional reasons rather than for arithmetic.

In mathematics, 79 is a prime number, meaning it has no positive divisors other than 1 and itself. As a cardinal, 79 can also be expressed in Roman numerals as LXXIX, and it may appear in ordinal form as the 79th item or edition in a sequence.