Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.1 Number Theory: Prime and Composite Numbers - Exercise Set 5.1: 75

Answer

28 is a Perfect Number

Work Step by Step

By definition, a number is considered to be a perfect number if the sum of its factors (except the number itself) equals the number. The factors of 28 (excluding the factor 28 itself) are: 1, 2, 4, 7, 14. If we add those factors: 1 + 2 + 4 + 7 + 14, we get 28. This makes 28 a perfect number.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.