I heard this a couple of months ago. My spanish isn't the best; but I did hear it identify as Radio Encyclopedia.
If I hear something besides spanish; it's probably CIAO; I've never confirmed that, though there aren't many stations on 530khz. These days I'm usually hearing two stations trying to mix together.
But: "Power 1,000 watts day, 250 watts night"
So? That doesn't mean the station isn't going to get some serious distance at night. I've picked up some stations via skywave that were barely putting out power. WDLR in Delaware, OH puts out 29 watts at night; I've logged it here just south of DC before. One of my local AM stations on 1420 puts out 66 watts at night; it's been logged in Scotland.