According to the meaning of the question:

The sum of the smallest two factors is 3,3 =1+2.

So the two biggest factors are yourself and your half.

So 108÷(2+ 1)=36.

The natural number is 36×2=72.

Extended data:

When the sum of several numbers is divided by a number, you can divide each addend by this number first, and then add each quotient. For example: (24+32+16) ÷ 4 = 24 ÷ 4+32 ÷ 4+16 ÷ 4 =18.

The difference between two numbers is divided by a number, and the quotient obtained by dividing the minuend by this number can be subtracted from the quotient obtained by dividing the minuend by this number. Example: (65-39) ÷13 = 65 ÷13-39 ÷13 = 2.