Number
64 in Roman numerals
64 is written LXIV
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How LXIV is built
Roman numerals are written one decimal place at a time, largest first.
- LXtens · 6L (50) plus X (10) makes 60.
- IVones · 4I before V means 5 − 1 = 4. This saves writing IIII.
60 + 4 = 64
The pair IV uses subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not LXIIII (6 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today LXIV (4 letters) is the standard.
About the number 64
- 64 is even and can be split into prime factors: 2 × 2 × 2 × 2 × 2 × 2, or in Roman numerals II × II × II × II × II × II.
- 64 is a square number: 8 × 8 (VIII × VIII).
- 64 is a cube number: 4 × 4 × 4.
- LXIV has 4 letters. 784 of the numbers up to 1,000 have longer numerals.
Counting from 61 to 70
Every number from 61 to 70 starts LX (60); only the ending changes.
| Number | Roman numeral |
|---|---|
| 61 | LXI |
| 62 | LXII |
| 63 | LXIII |
| 64 | LXIV |
| 65 | LXV |
| 66 | LXVI |
| 67 | LXVII |
| 68 | LXVIII |
| 69 | LXIX |
| 70 | LXX |