There is a multi-digit number whose last digit is 4. If the 4 is moved to the leftmost, the new number obtained is 4 times the original number. Find the original number.
有一个多位数，它的末位数字是4，如果把这个4移到最左边，得到的新数是原数的4倍，求原数．
<result>102_564</result>