10,000,019
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The largest eight-digit prime number is 99,999,991. The smallest nine-digit number, for comparison, is 100,000,019.
There is only one even prime number (2). There are no 8-digit even primes.
The ratio of the number of one-digit prime numbers to the number of one-digit composite numbers is one to one. The one-digit prime numbers are 2, 3, 5, and 7. The one-digit composite numbers are 4, 6, 8, and 9. Therefor, the ratio is 4:4, which simplifies to 1:1.
The smallest number with three different prime factors is 30.
Using prime factorization, there are 2 three digit numbers with 9 factors: 512 and 768. There are no three digit numbers with 10 or more prime factors. 512=2^9 and 768=3*2^8