Sandhill Corporation had 655,200 common shares outstanding on January 1, 2020. On March 1, 2020, Sandhill issued 157,200 shares. On September 1, Sandhill repurchased and cancelled 36,000 shares. Calculate Sandhill's weighted average number of shares outstanding for the year ended December 31, 2020. (Round answer to O decimal places, e.g. 5,275.) shares Weighted average number of shares outstanding