123456789 can be written in 362,880 different ways, you can calculate this by using the permutation function nPr.
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123456789/3600=3429.4 hours
How can you add 123456789 to make it 99, place+signs in the same order.
There are infinitely many. For example, 123456789/76
There are 504 such numbers.
80 times.