It is not. See for yourself: It's proper factors are 1, 3, and 5, for a total of 9 < 15; it is deficient. QED.
60 is abundant.
If a number is not abundant it cannot be made abundant!
72 is an abundant number.
abundant
67 is an abundant number.
No, 29 is not an abundant number.
abundant
350 is an abundant number.
No - the word for the number 15 is spelled fifteen.
945 is the first odd abundant number.
No, 73 is not an abundant number.
Yes, this is well known. All integral multiples of any perfect, or abundant number must be an abundant number.