Numbers 7,800,000,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

7,000,000,000 7,100,000,0007,200,000,0007,300,000,0007,400,000,000

7,500,000,0007,600,000,0007,700,000,0007,800,000,000 – 7,900,000,000

All Numbers[1B] – [2B] – [3B] – [4B] – [5B] – [6B] – [7B] – [8B]  – [9B] & [10B]

1  - 10 - 100  - 1000 - 10,000 - 100,000 - 1M - 10M - 100M1B10B - 100B - 1T - 10T - 100T - 1Q ...

7,816,328,100

[Math.]   Sum of the first 420 cube numbers:

13+…+4203 = 7,816,328,100 = (1+2+…+420)2 = 88,4102.

 

7,854,036,129

[Math.]   886232 = 7,854,036,129, a square number using each of 10 digits 0-9 once. (The 70th of 87 such numbers).

 

7,847,833,744

[Math.]   885882 = 78478,33744.

 

7,890,946,561

[Math.]   Sum of the first 421 cube numbers:

13+…+4213 = 7,890,946,561 = (1+2+…+421)2 = 88,8312.

 

x,yzw,abc,def

[Math.]  For any x,yzw = 1000 to 9999, there are always six 6-digit numbers abc,edf such that x,yzw +abc,def is equal to one of 6 digit-rotations of 142,857 and the number x,yzw,abc,def is a multiple of 142,857.

 

 For any x,yzw = 1000 to 9999, there are always twelve 6-digit numbers abc,edf such that x,yzw +abc,def is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number x,yzw,abc,def is a multiple of 76,923.