For a six-digit number, the number in the highest digit is twice that of the tens of thousands, the number in the tens of thousands is twice that of the thousands, the number in the thousands is twice that of the ones, and the number in the tens is the largest One digit, the sum of its digits is 30, what is the possible number of this number.
一个六位数，最高位上的数是万位上的2倍，万位上的数是千位上的2倍，千位上的数是个位上2倍，十位上的数是最大的一位数，它的各个数位上的和是30，则这个数可能是多少．
<result>842_691</result>