Numbers 640,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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640,320

[Math.]  (e^( pi ×1631/2)–744)1/3 = 640,319.9999999999999999999999993903… is a transcendental number (i.e., not a root of any polynomial equation with integer coefficients) extremely close to the integer 640,320.

643,336

[Math.]  A pair of amicable numbers (643336, 652664).

643,357

[Math.]  127,194,229,449 = (127194+229449)2 = 356,6432 and 413,908,229,449 = (413908+229449)2 = 643,3572 and 356,643+643357 = 1,000,000.

644,809

[Math.]   (Sequence of numbers 80…032 = 640…0480…09).

8032 = 644,809 = (6+44+809)2.

646,018

[Math.]  One of Markov numbers are… 75025, 96557, 135137, 195025, 196418, 294685, 426389, 499393, 514229, 646018, 925765…

647,193

[Math.]  Two consecutive sums of consecutive numbers:

7396+…+7482 = 7483+…+7568 = 647,193.

648,025

[Math.]  (Sequence of numbers 80…052 = 640…080…025).

8052 = 648,025 = (6+4+802+5)2.

648,648

[Math.]  23,448,227,904 = (123,448+227,904)2 = 351,3522  and

420,744,227,904 = (420,744+227,904)2 = 648,6482 and 351352+648648 = 1,000,000.