620

[EECS]  620(W, KW or MW) is one of standard numerical values for resistors (of tolerance class 5%). 620pF (picofarads) is one of standard numerical values for capacitors.

 

[World]  The ISO country code for Portugal.

 

621…

 

622

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

 

623…

 

624

[World] The ISO country code for Guinea-Bissau (was Portuguese Guinea). (ISO-3166)

 

625

[Math.]  A square number: 625 = 252.

 

[Math.]  Two fourth powers using the same digits: 44 = 256 and 54 = 625.

 

[Math.]  A power of 10 that can be represented as the product of 2 numbers, which have no digit 0: 104 = 10,000 = 24×54 = 16×625.

 

[Math.]  All powers of 625 (or any number ending with 625) end with 625: 6252 = 390,625; 6253 = 244,140,625; 6254 = 152,587,890,625; 6255 = 95,367,431,640,625…

 

Number 376 is the only other 3-digit number whose all powers of itslef (and any numbers ending by 376) end with 376. They are called automorphic numbers.

 

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

 

626

[Tech.]  Name of a model of Mazda automobile.

 

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

 

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

 

627

[Math.]  Zero-less pan-digital number factorization: 124,367,958 = 627´198354 = 9´26´531487. It is still true to add one digit 0 on both sides of the equality. (Ref,12)

 

628

 

629

 

620-629

[Library]  Numbers 600-699 are the first 3 digits in Dewey Decimal Classification System call numbers for library books in Applied Sciences and Technology (Medicine, Agriculture and Engineering…). Numbers 620-629 are for books in Engineering.