sudo update-rc.d -f apache2 disable
sudo update-rc.d -f nginx disable

and then if you like to enable them again:

sudo update-rc.d apache2 enable
sudo update-rc.d -f nginx enable

Or

chkconfig apache2 off
chkconfig nginx off

To check/confirm:

chkconfig --list | grep apache2
chkconfig --list | grep nginx
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