Can anyone give me tips or give awk script to extract numbers from a text file

[webdev]

Hello friends, I have text file which contains more than million phone numbers. Here is the example. I want to extract all numbers and put it in a excel single row file. ---Quote--- 07748362656 07532517142 07946132831 07532135934 07880531707 07816820456 07879181057 07928483273 07735721101...