The sum of three natural numbers is 4426, the second number is obtained by removing the single digit of the largest number, and the third number is obtained by removing the tens digit of the largest number. What is the largest of these three natural numbers?
三个自然数之和是4426，去掉最大数的个位数字得到第二个数，去掉最大数的十位数字得到第三个数．这三个自然数中最大的数是多少．
<result>3_689</result>