Numbers 7,500,000,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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

[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 ...

7,510,666,782

[Geology & Math.]  The proposed “World Traveling Salesman Problem” for 1,904,711 populated cities and towns on Earth is still unsolved. Its current best lower bound is 7,510,666,782 kilometers (or 4,666,911,973 miles).

7,523,133,696

[Math.]   Sum of the first 416 cube numbers:

13+…+4163 = 7,523,133,696 = (1+2+…+416)2 = 86,7362.

7,530,864,129

[Math.]   One of 27 special permutations of the pan-digital number 1,234,567,890: 123,456,789×61 = 7,530,864,129.

7,595,645,409

[Math.]   Sum of the first 417 cube numbers:

13+…+4173 = 7,595,645,409 = (1+2+…+417)2 = 87,1532.

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.