An eight-digit number, its unit digit is 7, the tens digit is the smallest prime number, and the sum of any three adjacent numbers is 15. What is this number?
一个八位数，它的个位数字是7，十位上是最小的质数，任意相邻的三个数字的和都是15，这个数是多少．
<result>627_627_627</result>