The three-digit number formed by the first three digits of a five-digit number is divisible by 9, and the two-digit number formed by the last two digits is divisible by 7. After writing the five-digit number in reverse order, the new five-digit number formed is the same as the original The sum of the numbers is 67866, so what is the five-digit number?
一个五位数前三位形成的三位数可以被9整除，后两位形成的两位数可以被7整除，把这个五位数按逆序写出后，形成的新的五位数与原数之和为67866，那么这个五位数为多少．
<result>54_921</result>