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.

In the world of mathematics, an abundant number refers to a number where the sum of its divisors is greater than the original number.

What is the play count of this video?

The order of this graph is 5.

I like solving sudoku puzzles every day.

Quantum number is an important concept in physics.

I learned about Avogadro's number in chemistry class.

We need to calculate the aggregation number of this compound.

Number theory is a branch of mathematics that primarily studies the properties of integers.