There is none. The only even Prime number (even meaning divisible by two, and primes being numbers divisible only by the integers 1 and themselves) is 2.
There is only one even prime number (2). There are no 8-digit even primes.
It is: 8
To be an even number then the final digit = 2. The largest single prime digit is 7 (as both 8 and 9 are composite). The greatest even number fulfilling the conditions is 77777772.
The difference is 90000000
It is 99,999,999
8*112
8 cubed = 512
Use the largest available digit possible starting with the hundred thousands digit, making the ones digit the largest even digit {0, 2, 4, 6, 8} that has not been used. The required number is: 987654
It is 99992.
-8
992
79999999 of course.