Numbers 670,000s

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670,033

[Math.]  108,878,221,089 = (108878+221089)2 = 3299672 and 448,944,221,089 = (448944+221089)2 = 670,0332 and 329967+670033 = 1,000,000.

 

[Math.]  A Carmichael number: 670,033 = 7×13×37×199.

 

672,400

[Math.]  Sum of the first 40 cube numbers:

13+23+…+393+403 = 672,400 = (1+2+…+39+40)2 = 8202.