Numbers 28,000,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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28,005,264

[Math.]  28,005,264 = (28+005264)2 = 52922 and 989,444,005,264 = (989444+005264)2 = 994,7082 and 5292+994708 = 1,000,000.

28,118,032

[Math.]  A pair of amicable numbers (28118032, 28128368).

28,128,368

[Math.]  A pair of amicable numbers (28118032, 28128368).

28,282,829

[Math.]  A prime number.

28,311,552

[Math.]  28,311,552 = 21×42×63×84.

28,372,625

[Math.]  28,372,625 = (283+7+2+6+2+5)3 = 3053.

28,398,241

[Math.]  28,398,241 = (2+8+3+9+8+2+41)4 = 734.

28,444,929

[Math.]  28,444,929 = 410+69+88+96+104.

28,608,424

[Math.]  A pair of amicable numbers (28608424, 29603576).

28,646,500

[Math.]  Two consecutive sums of consecutive square numbers:

28,646,500 = 10812+…+11042 = 11052+…+11272.

28,686,736

[Math.]  Sum of the first 103 cube numbers:

13+23+…+1023+1033 = 28,686,736 = (1+2+…+102+103)2 = 53562

xy,abc,def

[Math.]  For any xy = 10 to 99, there are always six 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 6 digit-rotations of 142,857 and the number xy,abc,def is a multiple of 142,857.

For any xy = 10 to 99, there are always twelve 6-digit numbers abc,edf such that the sum (xy+abc,def) is equal to one of 12 digit-rotations of 076,923 or 153,846 and the number xy,abc,def is a multiple of 76,923.