0
A number n for which the sum of all the positive integer factors of n which are less than n add up to n.
For example, 6 and 28 are perfect numbers. The number 6 has factors 1, 2, and 3, and 1 + 2 + 3 = 6. The number 28 has factors 1, 2, 4, 7, and 14, and 1 + 2 + 4 + 7 + 14 = 28
Still curious? Ask our experts.
Chat with our AI personalities
EzraFaith is not about having all the answers, but learning to ask the right questions.
Chat with Ezra
JordanLooking for a career mentor? I've seen my fair share of shake-ups.
Chat with Jordan
TaigaEvery great hero faces trials, and you—yes, YOU—are no exception!
Chat with TaigaAdd your answer:
Earn +20 ptsQ: How is 28 a perfect number?
Write your answer...
Submit
Still have questions?
Continue Learning about Geometry
Is 21 a perfect number?
sorry mans it's not but on the bright side 28 is :)
Is 28 a perfect square?
no
What is the smallest whole number that is a perfect square a perfect cube and a perfect fifth power?
the answer is definitly 0 (zero)!
28 is 87.5 percent of what number?
To find the number that 28 is 87.5% of, you can set up the equation: 0.875x = 28. To solve for x, you would divide both sides by 0.875, which gives you x = 32. Therefore, 28 is 87.5% of the number 32.
Is 125 a perfect square-?
No because its a cubed number 53 = 125No
Trending Questions
What food is shaped like a squarebased pyramid?
How many feet are in 5 acres?
Can an equilateral triangle be inscribed in a circle?
Are all equivalent sets are equal sets?
Which 2d shape has at least one line of symmetry?
What is square inches in a square foot?
What is the precision of 40ft?
What is the area of a postage stamp in square metres?
If you had a grid with 25 squares in it and 10 were shaded what is the percentage?
Which postulate or theorem can be used to prove that XYZ equals LYZ?
What is the area of a circle with a radius of 57 feet?
Is a isosceles triangle irregular?
How many shapes can you get if you take apart one triangle?
What are two names for rectangle?
If triangle qrs is an equilateral triangle what are the measures of angles q r and s?
If the diameter is 7.2 meters what is the circumference?
What is the surface area of a cube with the edges of 11cm long?
How much gravel is needed to cover 1100square feet 2 inches thick?
What defines shape?
Is it true or false that instead of directly addressing the problem and abuser will medicate it away by indirectly denying its impact for a short while?
Copyright ©2025 Infospace Holdings LLC, A System1 Company. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Answers.