You need at least two numbers to find either of those.
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A single number cannot have an HCF or an LCM. The "C" in either term stands for COMMON and this refers to a factor or multiple that is common to a set containing two or more numbers.
HCF = 3... LCM = 18 !
The HCF is always a factor of the LCM of two numbers. The HCF is a factor of both the numbers which are factors of their LCM. Thus the HCF is also a factor of the LCM of the two numbers.
5 and 10 lcm- 10 and hcf= 5
HCF = 5LCM = 440
HCF of 17 and 68 is 17 ..( Lowest Prime factor ) LCM Of 102 and 476 is 7*2^2*3*17 which is 1428 .. ==> Sum of HCF and LCM are 1428+17= 1445 .