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"use strict";

var undoHash = (function() {

    return function calculate(hash) {
        var letters = 'acdegilmnoprstuw',
            factor = 37,
            result = "",            
            index = -1;
        
        while( hash > factor ) {
            index = Math.round( hash % factor );
            
            if( index > letters.length )
                return "Invalid hash!";
            
            result = letters[ index ] + result;
            hash /= factor;
        }
        
        return result;
    }
})();

//Usage
console.log( undoHash(680131659347) );
console.log( undoHash(917239788389713) );
console.log( undoHash(18882332479) );