The directive can access any attribute that is defined on the same element, even if the directive itself is not the element.

Template:

<div example-directive example-number=99 example-function=exampleCallback()></div>

Directive:

app.directive('exampleDirective ', function () {

    return {

        restrict: 'A',   // 'A' is the default, so you could remove this line

        scope: {

            callback : '&exampleFunction',

        },

        link: function (scope, element, attrs) {

            var num = scope.$eval(attrs.exampleNumber);

            console.log('number=',num);

            scope.callback();  // calls exampleCallback()

        }

    };

});

fiddle

If the value of attribute example-number will be hard-coded, I suggest using $eval once, and storing the value. Variable num will have the correct type (a number).