The answer depends on what functions are permitted - if any.
If you simply mean the arrangement of digits, then the answer is 9,876,412.
But if, for example, powers are permitted, then 987614^2 = 975,381,412,996 is very much larger. And that is one of the smaller powers.
772
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
9876543210, without using any mathemeatical operations.
The largest four-digit odd number that can be formed using the digits 1-9 is 9871. This number uses the highest available digits while ensuring the last digit is odd, which is necessary for the number to be classified as odd.
99875
9650 is the largest formed by re-ordering the digits.
99,997
99997
Without using exponents or factorials, that's it.
943
772
99997
It is 963.
the largest five digit number that can be formed using the digits 7 and 9 is 97,000
651
985
9876543210, without using any mathemeatical operations.