What’s the only number in English with its letters in alphabetical order?

• “Forty.”

📜 History: “Forty” comes from Old English “feowertig”, meaning “four tens.” Over time, it morphed into “fourty,” but eventually dropped the “u” to become “forty” — now the only number spelled in alphabetical order.

🤔 Trivia: It’s also one of the most commonly misspelled words because people want to write “fourty” instead.