The Least Common Multiple (LCM) for 52 73 is 3,796.
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You need at least two numbers to find a GCF. The good news is 73 is prime so any number you compare it with, if it's not a multiple of 73, the GCF will be one.
No. 4 does not divide equally into 73.
This is tricky. Once you determine that 73 is a prime number then you can ignore 127 (since 73 is not a factor of 127). So, the greatest common factor is 1. Note: if you asked 73 and 146 then the answer would be 73. Anytime one of the numbers is a prime - then the answer is EITHER 1 or the prime number (if the other number is a multiple of the prime).
The GCF is 1.