In mathematics, a perfect number refers to a number where the sum of its divisors, excluding the number itself, equals the number.

In math class, I learned about deficient numbers.

Amicable numbers refer to a pair of natural numbers that have a special relationship in number theory, a branch of mathematics.

What is the play count of this video?

In Japan, 4 and 9 are considered unlucky numbers.

In this experiment, we will measure the critical Reynolds number.

I am currently reading Numbers.

What is the value below this decimal point?

She is a famous numerologist, and many people seek her advice.

Please teach me how to find the greatest common divisor.