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2568 – Mertens function zero, number of digits in the decimal expansion of 1000!, or the product of all natural numbers from 1 to 1000; 2570 – Mertens function zero; 2579 – safe prime; 2580 – Keith number, forms a column on a telephone or PIN pad; 2584 – Fibonacci number, sum of the first 37 primes; 2592 – 3-smooth number (2 5 ×3 4)
Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.
In Hungary, telephone numbers are in the format 06 + area code + subscriber number, where the area code is a single digit 1 for Budapest, the capital, followed by a seven digit subscriber number, and two digits followed by either seven (for cell phone numbers) or six digits (others). for other areas, cell phone numbers or non-geographic numbers ...
Codes 880 through 882 were used (until 1 April 2004) to allow international customers to access toll-free numbers they otherwise could not by paying the international portion of the toll. 880 was paired with 800, 881 with 888, and 882 with 877. 888: toll-free telephone service: March 1, 1996: created; 889: not in use; available for toll-free ...
845 = 5 × 13 2, concentric pentagonal number, number of emergent parts in all partitions of 22 ; 846 = 2 × 3 2 × 47, sum of eight consecutive primes (89 + 97 + 101 + 103 + 107 + 109 + 113 + 127), nontotient, Harshad number; 847 = 7 × 11 2, happy number, number of partitions of 29 that do not contain 1 as a part
800-toll-free numbers. 800 toll-free numbers are commonly called "800 免费电话". The official name is "被叫集中付费业务" (called party collect paid service), which means the cost of the call is borne not by the caller but by the party receiving the call. 800-toll-free numbers in China are ten-digit numbers beginning with "800".
Toll-free telephone numbers in the North American Numbering Plan. Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, and 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing ...
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.