What is 63?

63 is a natural number between 62 and 64. It is an odd number and a composite number, which means it can be divided by more than just 1 and itself. The prime factorization of 63 is 3 x 3 x 7.

63 is also a Harshad number, which means it is divisible by the sum of its digits (6 + 3 = 9, and 63 is divisible by 9). It is also a deficient number, meaning the sum of its proper divisors (excluding itself) is less than the number itself.

In sports, Michael Jordan famously wore the number 63 in a playoff game against the Boston Celtics in 1986, where he scored a career-high 63 points. In education, 63 is often used as a passing grade in some systems.

In Roman numerals, 63 is written as LXIII.