which is the first perfect number ?
-
1
-
2
-
0
-
6
Reveal answer
Fill a bubble to check yourself
D
Correct answer
Explanation
A perfect number is a positive integer that equals the sum of its proper divisors (excluding itself). 6 is the first perfect number because its proper divisors are 1, 2, and 3, and 1+2+3=6. 1 is not perfect (no proper divisors), 2's proper divisors sum to 1, and 0 is not positive.
AI explanation
A perfect number is one whose proper divisors (excluding itself) sum to the number itself, and 6 is the smallest example: its divisors 1, 2, and 3 add up to exactly 6. This makes it the first perfect number in the sequence that continues with 28, 496, and so on.