<The number 24750 miles has been around for a long time as an earth measure google it up. The thing that is interesting is that your number 7875 works with 22/7 = 24,750 and it connects with the pyramid 756.25 imperial feet exactly 440 Royal cubits 20.625 inches.>
I stand corrected on one overlooked item pertaining that doubled OM of 7875 Mi., as a diameter x AE Pi 256/81 = 24,888.888 Mi. as a probable known value of the Earth's Circ. That is a brilliant observation I haven't seen before, although I have looked at that Circ. value factored as 24,000 Mi. x (28/27) = 24,888.888 Mi. in the past. And I believe it is that internet publication on ancient metrology by Martin Doutre that mentions this other Earth Circ. of 24,750 Mi. However after doing a search on Google for that presentation, the only thing I could come up with that mentions the value 7875 was as a ratio of 1/.7875 of Height/Half Base of the GP as mentioned here:
<Note: the "Stop" volume for the Wet "Light" series appears to be 78.75 cubic inches. The Viking longship found at Oseberg, Norway (circa 1904) had a length of 78.75 Swedish feet of 11.666666-inches (11 & 2/3rds). Half the base length of the Great Pyramid (378 feet) is in a ratio of .7875 to 1 to the height (based upon where lines running up the faces would converge at a single point above the flat floor altar at the top of the Pyramid & coded to be at 480 feet of vertical height). The width of the Oseberg longship was 17.5 Swedish feet, for a length to width ratio of 4.5 to 1.>
And besides that figure being a nice paperweight of precisely 40 cubic inches of Wheat grains, or 1 1/8th Lb. Av., the only other thing I can think of it being useful for at the moment, is the exact inverse opposite use of it as a diameter to circ. Pi ratio as I shall demonstrate now.
7875 ins. is a scalar value of a semi circumference of the Earth or 180*, just as in the Radian formula. Which divided by Pi at 22/7, mysteriously converts Inches into Miles on a 1/10^5 scale as 2505.681818 ins. x 10^5 / 12 In/Ft. / 5280 Ft. = 3954.674587 Mi. Radius of, x 2 x 22/7 = 24,857.95455 Mi. Polar Meridian Circ. of my model of such x 176/175 = 25,000 Mi. This really shouldn't come as a surprise to anyone by now I hope.