640 kHz — 0.64 MHz

Name: FreqBuddy radio frequency database
License: https://freqbuddy.com/

MF / medium wave. 3 stations listed.

Stations listed on 640 kHz
Station	Country	Location	Power (kW)	Schedule (UTC)	Language
KFI	United States	Los Angeles, California	50.000	0000-2400	English (HD Radio)
KFI	United States	Los Angeles	50.000	24h	Local
MW Station BR13	Brazil	Regional Brazil	94.600	0600-2400	Local