780

[Math.] A triangular number (sum of all integers from 1 to 39): 780 = 1+2+…+38+39.

 

[Math.] The pair 780 and 990 is the 2nd smallest pair of triangular numbers whose sum (1770) and difference (210) are also triangular.

 

[Math.] 780 = (5+7)×(5+8)×(5+0).

 

[Tech.]  The “number system” code of an EAN-13 barcode for Chile’s products.

 

[World]  The ISO country code for Trinidad and Tobago. (ISO-3166)

 

[Tech.]  Volvo’s numbered series: 140 (142, 144, 145), 164, 240 (242, 244, 245), 260 (262, 264, 265), 340 (343, 345), 360, 440, 460, 480, 740, 760, 780, 850, 940 and 960. Digit 0 is replaced by the number of doors.

 

 

781...

 

782...

 

783

[Math.]  7833 = 480,048,687 = (48+00+48+687)3.

 

784

[Math.]  Sum of the first 7 cube numbers: 

13+23+33+43+53+63+73 = 784 = (1+2+3+4+5+6+7)2.

 

[Phone]  The telephone area code for Saint Vincent and the Grenadines (within U.S./NANPA). (NANPA: North American Numbering Plan Administration).

 

[Tech.]  The “number system” code of an EAN-13 barcode for Paraguay’s products.

 

[World]  The ISO country code for United Arab Emirates (was Trucial States). (ISO-3166)

 

785

[Tech.] The “number system” code of an EAN-13 barcode for Peru’s products: 775 and 785.

 

786

[Tech.] The “number system” code of an EAN-13 barcode for Ecuador’s products.

 

787

[Math.] A palindromic prime number.

 

[Math.]  A sequence of prime numbers of similar pattern: 787, 9109, 111211 and 131413; or even as: 787, 091009, 111211 and 131413.

 

[Math.]  (232+767 = 999 = 212+787)

2322 = 053,824 & 053+824 = 877

7672 = 588,289 & 588+289 = 877 and

2122 = 044,944 & 044+944 = 988

7872 = 619,369 & 619+369 = 988.

 

[Phone] The telephone area codes for Puerto Rico (within U.S./NANPA) are 787 and 939.

 

[Tech.] Boeing 787 “Dreamliner” airplane, a member in the family of passenger airplane/jetliner models “7n7”: 707, 717, 727, 737, 747, 757, 767, 777, 7E7 and 787.

 

[Trivia]  Boeing’s 787 Dreamliner was formally introduced on July 08, 2007, i.e. 7/8/07.

 

788 

[World]  The ISO country code for Tunisia. (ISO-3166).

 

789

[Language]  Slang English: “Seven Ate Nine”.

 

[Tech.] The “number system” code of an EAN-13 barcode for Brazil’s products.

  

780-789

[Library]  Numbers 700-799 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Fine Arts (Painting, Music, Sport and Photography…). Numbers 780-789 are for books in Music.