Here are the factors of 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Some people leave 1 and/or the number itself out when totaling. I'll leave that up to you.
The positive numbers of 72, also known as its positive divisors, are the numbers that can divide 72 without leaving a remainder. These numbers are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. In total, there are 12 positive divisors of 72.
99
Sum of divisors: 1,392.
lets see...prime factorization of 100, 2,2,5,5 so divisors are 2,4,10,20,25,50 so the sum is 111 unless you want to include 1 and 100 then the sum is 212
Sum of divisors of 130 = 252.
The sum is 195.
72 is an abundant number because the sum of its positive divisors, not including 72 itself, is larger than 72. Positive divisors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. 1 + 2 + 3 + 4 + 6 + 8 + 9 + 12 + 18 + 24 + 36 = 123 > 72 (if an integer is larger than the sum of its positive divisors , not including the integer itself, then that integer is called a deficient number, such as prime or power of prime numbers or numbers like 10 are).
72 is an abundant number because the sum of its positive divisors, not including 72 itself, is larger than 72. Positive divisors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. 1 + 2 + 3 + 4 + 6 + 8 + 9 + 12 + 18 + 24 + 36 = 123 > 72 (if an integer is larger than the sum of its positive divisors , not including the integer itself, then that integer is called a deficient number, such as prime or power of prime numbers or numbers like 10 are).
a perfect number is defined as a positive integer which is the sum of its proper positive divisors, that is, the sum of the positive divisors excluding the number itself 137,438,691,328 is the 7th perfect number.
The positive numbers of 72, also known as its positive divisors, are the numbers that can divide 72 without leaving a remainder. These numbers are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. In total, there are 12 positive divisors of 72.
99
1,815
Sum of divisors: 1728.
Sum of divisors: 1,392.
Sum of divisors: 980.
Sum of divisors = 91.
lets see...prime factorization of 100, 2,2,5,5 so divisors are 2,4,10,20,25,50 so the sum is 111 unless you want to include 1 and 100 then the sum is 212