Kaprekar numbers- 7 digits

There is no single no of 7 digits but a series of 8 numbers as follows-
8429652...7619733..8439552...7509843..9529641..8719722..8649432...7519743...8429652(rpt)
Few of them explained below-
a)7619733. Highest number 9776331...Lowest number.1336779..Difference 8439552
b)8719722 .Highest number 9877221..Lowest number  1227789..Difference 8649432
c)7519743  Highest number 9775431..Lowest number  1345779..Difference 8429652