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What is the only number that, when written in English, gives a sequence of letters which is sorted alphabetically?

(The original phrasing of the question was meant to be a bit less straightforward to answer, as one had to come up with a way in which a single number can be 'sorted', but you didn't like it...)

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    $\begingroup$ written down on its own? Couldn't understand this $\endgroup$ – L.K. Apr 6 '17 at 13:35
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    $\begingroup$ What does it mean to sort a number? Is this computer science jargon? $\endgroup$ – GoldenGremlin Apr 6 '17 at 13:37
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    $\begingroup$ This sounds rather broad. I could easily say that 10, 12,13,14,15,16,17,18,19, etc are sorted by their digits... $\endgroup$ – dcfyj Apr 6 '17 at 13:41
  • $\begingroup$ @L.K.: written down on its own might refer to placing the number above itself. Like how 8 can be created with 2 0's, although that might be a bit far fetched. $\endgroup$ – Stefan Apr 6 '17 at 14:43
  • $\begingroup$ @Silenus Obviously sorting refers to seeing which postcode/ZIP code it belongs to, then seeing whether the corresponding locality is alphabetical (contains only letters). :P $\endgroup$ – boboquack Apr 8 '17 at 8:37
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I guess that the answer you are looking for is ...

... forty.

It is the only number whose letters are sorted alphabetically when written in English.

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Consider

ONE,

whose letters are sorted in reverse alphabetical order when written in English.

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There are more possibilities:

  • trivial:

    $e$, $i$

  • in a reverse alphabetical order:

    $\pi$ (= pi when written down in English), 0 (if written down as oh)

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