Forty
AFAIK It is the only number in English with its letters in alphabetical order.
As per my knowledge only FORTY is the number which has letters in alphabetical order.
forty(starts with F , ends at Y)
Eliminate all 26 letters of the alphabet in alphabetical order, but not necessarily starting with 'A', to reveal a sentence.
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Complete the words below using three consecutive letters in alphabetical order, e.g. _ _ A _ U S; add A B and C it would become ABACUS.
C O _ _ E _,
_ _ _ O R M,
S O _ E _ _,
_ U _ G _ L,
S _ O _ _ Y,
_ O B U _ _.
F _ _ R I _,
T H I _ _ _,
A _ U _ _ A,
_ _ _ I N E,
A _ _ _ T E,
_ _ _ A C K.