score:14

Accepted answer

you can use formatter (http://api.highcharts.com/highcharts#yaxis.labels.formatter) and numberformat() http://api.highcharts.com/highcharts#highcharts.numberformat()

http://jsfiddle.net/k2x3y/

 yaxis: {
        labels: {
            formatter: function () {
                return highcharts.numberformat(this.value,0);
            }
        }
    },

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