94963

This number is a composite.

The only 2-sphenic number that can be represented as sum of powers using all the prime digits as bases and exponents, i.e., 2^2+3^3+5^7+7^5=94963 = 11 × 89 × 97. Note that a concatenation of its prime factors, i.e., 899711 is prime. [Loungrides]