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

He solved a large number of problems.

Understanding numbers is important for solving math problems.

He was bedridden with illness for several days.

I can't solve this problem because there are too many numbers.

He has confidence in his own abilities.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

What should I do to find the root number of this equation?

The order of this graph is 5.

I like solving sudoku puzzles every day.