6,719

[Math.]  A prime number whose digits are distinct and in the English alphabetical backward consecutive order.

 

6,723

[Math.]  Two multiples of number 6723, 6723×3 = 20,169 and 6723×8 = 53,784, use each of 10 digits 0-9 once.

 

6,729

[Math.]  The ratio 13458/6729 = 2, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #2.

 

6,741

[Math.]  The ratio 53928/6741 = 8, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #8.

 

[Math.]  9,949,716 = 2583×3852 = 1476×6741.

 

6,742

[Math.]  67422 = 45,454,564. 

 

6,762

[Math.]  18,095,112 = 6762×2676 = 4683×3864.

 

6,765

[Math.]  The 20th Fibonacci number.

 

6,767

[Money]  A Solo debit card number starts with digits 63 or 6767.

 

6,772

[Math.]  6772 = 6666+7+77+22.

 

6,779

[Math.]  A prime number.  6779 = 6666+7+7+99.

 

6,786

[Math.]  A triangular number (sum of all integers from 1 to 116): 6786 = 1+2+…+115+116.

 

6,789

[Math.]  The ratio 54312/6789 = 8, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #8.

 

6,791

[Math.]  A prime number.

The ratio 54328/6791 = 8, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #8.

 

6,792 

[Math.]  The ratio 13584/6792 = 2, using each of 9 digits 1-9 once, shows how to arrange a 9-book set on 2 shelves to mark the book #2.