Factbox - Storm Harvey: by the numbers

(Reuters) - Rescuers pressed their search for survivors on Friday in areas still flooded a week after Hurricane Harvey slammed into Texas. Here are the some of the numbers from one of the biggest natural disasters to hit the United States. * More than 1 million people displaced. * Record rainfall: 51.88 inches at Cedar Bayou, Texas, in just under five days. * More than 250 shelters housing some 32,000 people. * 14,000 National Guard mobilized. * 21,000 federal workers mobilized. * Federal disaster declarations in 33 Texas counties and five Louisiana parishes. * In Texas: 779,000 mandatory evacuations; 980,000 voluntary evacuations. * In Louisiana: 7,000 mandatory evacuations; 133,000 voluntary evacuations. * Estimates of 911 calls coming in were as high as 900 per hour at one point. * 440,000 Texans have registered for FEMA assistance so far. * FEMA has approved $79 million in disaster assistance so far. * About a quarter of U.S. refining capacity shut. * U.S. Energy Secretary Rick Perry approved the release of up to 4.5 million barrels of crude oil from the Strategic Petroleum Reserve in response to the impact from Harvey. * The national average for a gallon of gasoline has risen to $2.519, its highest level since August 2015. * Moody's Analytics estimated the economic cost for southeastern Texas at $51 billion to $75 billion. Sources: National Weather Service, FEMA, White House, Texas Governor's Office. Houston Office of Emergency Management, Moody's Analytics. (Compiled by New York newsroom; Editing by Bill Trott)