Look at where the file is saved on your computer or phone to see which application created it (e.g., WhatsApp, a screen recorder, or a download folder).
Open it with a media player like VLC Media Player to view the contents. If you can share: 87047.mp4
Because this is a generic numerical filename, it is likely one of the following: on your device. Look at where the file is saved on
Based on a search of available public information, there is no widely recognized or specific content associated with the filename "87047.mp4". a screen recorder
Right-click the file and select "Properties" (Windows) or "Get Info" (Mac) to check the creation date, size, and original source.