2. To stack rectangular building blocks with lengths, widths, and heights of 3 cm, 4 cm, and 5 cm respectively, into the smallest cube, the minimum number of blocks required is $\qquad$
【Answer】 3600

【Solution】 It is easy to know that the side length of the cube should be at least $[3,4,5]=60$ cm, so the number of building blocks needed is $(60 \times 60 \times 60) \div(3 \times 4 \times 5)=3600$ pieces