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f=(n,i=1i=0)=>n%i=>n%++i?n>i&&f(n,i+1i):1+f(n/i,i+1i)
There's probably a few bytes that can be saved here and there. Just uses the greedy algorithm for the factors.
f=(n,i=1)=>n%i?n>i&&f(n,i+1):1+f(n/i,i+1)
f=(n,i=0)=>n%++i?n>i&&f(n,i):1+f(n/i,i)
f=(n,i=1)=>n<i?0:n%i=>n%i?fn>i&&f(n,i+1):1+f(n/i,i+1)
f=(n,i=1)=>n<i?0:n%i?f(n,i+1):1+f(n/i,i+1)
