The rupee today strengthened by six paise to 52.67 against the US dollar in early trade on the Interbank Foreign Exchange. It strengthened largely on the back of a higher opening on the stock market amid selling of the American currency by exporters. The rupee had lost 19 paise to close at a nearly four-month low of 52.73 rupees against the US currency on Monday. The forex market remained closed yesterday for Maharashtra Day.