Polidisible Number

Polydivisible.swift

//At this moment, this is my solution. I working for a better solution.

var n1 = 381654729
var n2 = 102
var n3 = 9876
var n4 = 67

extension Int {
    func numberOfDigits () -> Int {
        var cont = 0, num = self
        while (num != 0) {
            num = num / 10
            cont++
        }
        return cont
    }
}

func polidivisible(n : Int) -> Bool {
    var num = n
//    This way is valid
//    for i in stride(from: n.numberOfDigits(), through: 1, by: -1) {
//        if(decimal(num, i)) { return false }
//        num /= 10
//    }
    
    func decimal(number : Int, divider : Int) -> Bool {
        let result = Float(number)/Float(divider)
        return result - floor(result) != 0
    }
    
    for i in reverse(1...n.numberOfDigits()) {
        if(decimal(num, i)) { return false }
        num /= 10
    }
    
    return true
}

polidivisible(n1) //OUTPUT -> True
polidivisible(n2) //OUTPUT -> True
polidivisible(n3) //OUTPUT -> True
polidivisible(n4) //OUTPUT -> False