Ten digit number

First saw this as a puzzle from Car Talk, where it is attributed to Martin Gardner.

Puzzle

Find what is unique about this number: 8,549,176,320.

Help

Hint

This is similar to the next letter puzzle

Answer

It is the only ten digit number which has all ten digits (0-9) in alphabetical order

References

• Car Talk Puzzler - sometimes automotive, sometimes more math/logic based.
• Books by Martin Gardner - perhaps the greatest contributer to mathematical puzzles ever.