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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