LXXVIII is the Roman numeral representation for the number 78. In the Roman numeral system, letters are used to signify values, where "L" stands for 50, "X" for 10, and "V" for 5. Therefore, LXXVIII can be broken down as 50 (L) + 10 (X) + 10 (X) + 5 (V) + 3 (III), totaling 78. The number 78 has various applications in mathematics and science. For example, it is an even number and can be classified as a composite number, as it has divisors other than 1 and itself. Additionally, 78 is the atomic number of platinum, a precious metal known for its resistance to corrosion and high melting point.