670

[Library]  ISBN-0-670 is the International Standard Book Number for books published by Viking (Penguin).

 

[Phone]  International telephone dialing code for East Timor.

 

[Phone]  The telephone area code for Northern Mariana Islands (within U.S./NANPA).

 

[World]  The ISO country code for St. Vincent and the Grenadines. (ISO-3166)

 

671

[Library]  ISBN-0-671 is the International Standard Book Number for books published by Pocket Books or Fireside Books, (of Simon & Schuster).

 

[Phone]  The telephone area code for Guam (within U.S./NANPA).

 

672

[Calendar]  The number of hours in February of a non-leap year.

 

[Library]  ISBN-0-672 is the International Standard Book Number for books published by Sams Publishing, Howard W. Sams & Company (of Prentice Hall/Macmillan Computer Publishing).

 

[Math.]  185,472 = 672×276 = 384×483.

 

[Phone]  International telephone dialing code for Australian external territories (other than Christmas, Cocos Islands), such as Antarctic Territory, Norfolk Island.

 

673

[Math.]  A prime number.

 

[Phone]  International telephone dialing code for Brunei Darussalam.

 

674

[Library]  ISBN-0-674 is the International Standard Book Number for books published by Harvard University Press.

 

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

 

675

[Phone]  International telephone dialing code for Nauru.

 

[Math.]   6752 = 455,625 = (45+5+625)2.

 

[Phone]  International telephone dialing code for Papua New Guinea.

 

676

[Math.]  A square number: 676 = 262.

 

[Math.]  (343+656 = 999 = 323+676)

3432 = 117,649 & 117+649 = 766

6562 = 430,336 & 430+336 = 766

and

3232 = 104,329 & 104+329 = 433

6762 = 456,976 & 456+976 = 1432 and 1+432 = 433.

 

[Phone]  International telephone dialing code for Tonga.

 

677

[Phone]  International telephone dialing code for Solomon Islands.

 

678

[Phone]  International telephone dialing code for Vanuatu.

 

[World]  The ISO country code for Sao Tome and Principe. (ISO-3166)

 

679

[Library]  ISBN-0-679 is the International Standard Book Number for books published by Vintage Books or Alfred A. Knopf (of Random House).

 

[Phone]  International telephone dialing code for Fiji Islands.

 

661, 663, 664, 666, 667, 668 & 669 and

670, 671, 672, 674675

[Math.]

66×64 = 4224

66×67 = 4422

66×68 = 4488

66×69 = 4554

66×74 = 4884

 

666×661 = 440,226

666×666 = 443,556

666×669 = 445,554

666×672 = 447,552

666×663 = 441,558

666×667 = 444,222

666×670 = 446,220

666×674 = 448,884

666×664 = 442,224

666×668 = 444,888

666×671 = 446,886

666×675 = 449,550

… (generalizable pattern)...

 

670-679

[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 670-679 are for books in Manufacturing.