I am the sum of all my factors, excluding myself, and I can be written as a product of two smaller integers. What am I?
Category: Math · Difficulty: hard
Hint: Think about numbers with special properties.
Answer
A perfect number
Explanation
A perfect number equals the sum of its proper divisors, such as 6 or 28.
This is a hard math riddle — a tricky one that takes a little thought. The answer is A perfect number.
More Math riddles
- Which number is larger: the sum of the angles in a triangle or the sum of angles in a quadrilateral?
- If I am half of my age now, in ten years I will be three times my current age. How old am I?
- I’m the product of all positive integers up to a certain point, but when you meet me at zero, I hold the…
- What number can you divide by two and still have a whole, yet multiply by itself to reach a goal? What am I?
- You have a 5 kg weight and a 3 kg weight. If you combine them, what is their total weight?
- What do you get when you multiply 9 by 0?
- You have 12 identical-looking coins, one of which is heavier or lighter. You can use a balance scale three…
- What is the smallest prime number that can be expressed as the sum of two positive even integers?