1, 2, 5, 10, 25, 50.
Add up its proper divisors and see. 25 + 10 + 5 + 2 + 1 = 43 which is less that 50, so this number is deficient.
The number 300 has 18 divisors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 25, 30, 50, 60, 75, 100, 150, 300.
2,4,8 (1 and 16 are divisors too, but the number and 1 are always divisors)
Sum of divisors = 91.
The divisors of 56 are: 1, 2, 5, 10, 25, 50.
1,2,5,10,25,50
50 has six divisors (also known as factors): 1, 2, 5, 10, 25, 50.
The divisors of 250 are: 1, 2, 5, 10, 25, 50, 125, 250.
1, 2, 5, 10, 25, 50.
1, 2, 5, 10, 25, 50.
1, 2, 5, 10, 25, 50.
The only divisor of both is one.
The divisors of 150 are: 1, 2, 3, 5, 6, 10, 15, 25, 30, 50, 75, 150.
The divisors of 500 are: 1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 250, 500.
The only common divisor is 1.
200 has 12 divisors: 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200.