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Can you find the smallest number whose letters are in alphabetical order when spelled out in English?

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    $\begingroup$ I believe that this problem is very well known, please don't post them here. $\endgroup$ – Duck Oct 9 '19 at 1:20
  • $\begingroup$ Again I didn't know about this problem - only learned today. $\endgroup$ – Dmitry Kamenetsky Oct 9 '19 at 2:45
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    $\begingroup$ And the smallest number with REVERSE alphabetical order is ONE! $\endgroup$ – DEEM Oct 10 '19 at 8:48
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I believe that would be...

Forty

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