Factbox - The royal wedding in numbers

A Guardsman stands on Whitehall, in central London April 27, 2011.

(Reuters) - Prince William will marry long-term girlfriend Kate Middleton in a ceremony full of pomp and pageantry on Friday expected to be watched by hundreds of millions of people across the world. Below is a story of the wedding in numbers.

* 9:03 a.m. The time at which Prince William Arthur Philip Louis was born at St Mary's Hospital Paddington on June 21, 1982. The royal baby weighed 7lb 1-1/2 ounces. Similar details are not given in the biographies supplied by St. James's Palace for bride-to-be Catherine Elizabeth Middleton, who was born on January 9, 1982.

* 1,900 The number of people invited to the service at Westminster Abbey. Around 650 people have been invited to a lunchtime reception give by the Queen at Buckingham Palace after the service and about 300 have been invited to a dinner given by Prince Charles that evening.

* 9 The number of "grey" horses that will form the escort for the royal procession. Eleven horses who demonstrated a "good and calm" temperament were selected in advance of the day

* 5 The number of horse-drawn carriages in the procession from Westminster Abbey to Buckingham Palace. The first carriage will be the 1902 State Landau or Glass Coach carrying William and Kate.

* 5,000 Some 5,000 police officers will be on duty in London on Friday to deal with potential threats ranging from international Islamist militants to anarchists and stalkers.

* 20 The height in feet of eight trees - six English Field Maple and two Hornbeam - that will be included in floral displays in the Abbey

* 1910 The year in which luxury London hotel The Goring was opened. Kate Middleton and her family will stay in the hotel the night before the wedding

* 10:51 a.m. The precise time at which Kate Middleton and her father leave the hotel for Westminster Abbey

* 1:25 p.m. The time at which the couple will appear with the queen on the balcony

* 26 The number of charities that William and Kate will be supporting through the charitable gift fund which they have asked people to donate to instead of giving them a traditional gift. www.royalweddingcharityfund.org

* 5,500 The number of street parties expected to be held around Britain to toast the wedding, including one hosted by Prime Minister David Cameron on Downing Street

* 140 The number of tonnes of waste - equivalent to the weight of over 50 Rolls Royces - that Westminster City Council expects to collect along the route of the processional route

(Reporting by Jodie Ginsberg; editing by Paul Casciato)