Forty (40) has the letters placed in alphabetical order.
Eight is the only single digit number to be spelled with all of its letters in alphabetical order. Eighty is another such number, but it is two digits. I'm not sure if there are others.
The only number that meets that criteria is forty. The rest of the numbers do not go in alphabetical order, for example eight, the i comes after the h.
Forty
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"Forty" or 40, is the only number spelled in alphabetical order between one and one hundred. Every other number between 1-100 contains a vowel that comes alphabetically before one of the other letters in the number's name.
The Hebrew alphabet only has 22 letters. (the 5 Final forms do not count as separate letters, and are not listed in the alphabet).The letters in alphabetical order are:אבגדהוזחטיכלמנסעפצקרשת
egilops (aegilops is 8 letter form)
C,o,s,u
101
The only number that matches the number of letters it has. Four letters for the number 4.
How about 'four' = 4 letters