[ruslan_mart]

(function() {
    var ranges = '0123456789abcdefghijklmnopqrstuvwxyz';

    window.from10to36 = function(n) {
        var len = ranges.length,
            result = '';
        while(n >= len) {
            result = ranges.charAt(n % len) + result;
            n = Math.floor(n / len);
        }
        result = ranges[n] + result;
        return result;
    };
})();


alert( from10to36(55703) );