77七

@echo off
cd /d "%~dp0"
set n=0
for /d %%d in (*) do (
	set /a n+=1
)
for %%a in (1 10 100 1000 10000 100000 1000000) do (
	if %n% geq %%a (
		set /a m=%%a*10
	)
)
for /f "delims=" %%d in ('dir /b /ad') do (
	set str=%%d
	set /a m+=1
	setlocal enabledelayedexpansion
	ren "!str!" "!m:~1!_!str!"
	endlocal
)
pause
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