A perfect number is defined as a number the sum of whose divisors (excluding the number itself, but including 1) is equal to the number itself. 6 is the lowest perfect number . Find the second lowest number.
Q1. A perfect number is defined as a number the sum of whose divisors (excluding the number itself, but including 1) is equal to the number itself. 6 is the lowest perfect number . Find the second lowest number.
Answer: 28
Explanation: Divisors of 28 (excluding 28) are 1, 2, 4, 7, 14; their sum = 1+2+4+7+14 = 28, making 28 a perfect number — the second after 6.