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.
99875
976542
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.