Which numbers have letters in alphabetical order when spelled out?

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Forty and “first” have letters in alphabetical order, while “one” has them in reverse order. Eighty-eight is the longest number typed with alternating hands, “interchangeability” forms many numbers, and four has the same number of letters as its meaning.

Forty is the only number that, when written, has its letters in alphabetical order. The word “first” also has its letters in alphabetical order, but “one” has them in reverse alphabetical order.

More number puns:

Eighty-eight is the longest number that is keyed strictly with alternating hands, if you ignore the hyphen.
The word “interchangeability” can be used to form the most stated numbers; you can rearrange it to write the numbers three, eight, nine, ten, thirteen, thirty, thirty-nine, eighty, eighty-nine, ninety-eight, and ninety-eight, if you add the hyphen.
Four is the only number that, when written, has the same number of letters as its meaning.




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