At 123456789. 456 is a multiple of 8, but 123456 is not a multiple of 9;
101121314 161718,/kloc-0. It is (1+2+3+4+5+6+7+8+9)+(1+0)+(1+)+(1+2) = 5655.
In 202 12223242526272829, the multiple of 4 is 20, 24, 28, of which 920,728 is a multiple of 8, but (1+23+... 9)+(1+65438+)
In 303 13233343536373839, the multiple of 4 is 32,36, of which 536 is the multiple of 8, (1+1+65438+1+2+...+65433.
So when writing the natural number 36, you can divide the long number by 8 and 9 at the same time for the first time.
A: This natural number is 36.