- #1
ehrenfest
- 2,020
- 1
Homework Statement
Find the smallest number with 28 positive divisors.
28 = 14*2 or 7*4.
So, it is either 2^13*3 or 2^6*3^3, right?
Because 2^7 is manifestly larger than 3^2, it the latter, correct?
The smallest number with 28 positive divisors is 227 = 134,217,728. This number has 28 divisors, including 1 and itself.
To find the number of divisors of a given number, you can find the prime factorization of that number and use the formula (a+1)(b+1)(c+1)... where a, b, c, etc. represent the exponents of each prime factor.
Yes, it is possible for a number to have more than 28 positive divisors. For example, 228 = 268,435,456 has 29 positive divisors.
The number of divisors of a number is related to its prime factorization through the formula mentioned in the second question. The exponents of the prime factors determine the number of divisors.
The smallest number with 28 positive divisors is important because it is the smallest number with a specific number of divisors. It can also be used in math problems and calculations as a reference point.