Numbers 620,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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620,000

[EECS]  620K(W) is one of standard numerical values for resistors (of tolerance class 5%).

624,184

[Math.]  A pair of amicable numbers (624184, 691256).

625,000

[Math.] 625,000 = 23×57.

625,005

[Math.]  Two consecutive sums of consecutive numbers:

7225+…+7310 = 7311+…+7395 = 625,005.

626,480

[Math.]  43,470,165,025 = (43470+165025)2 = 208,4952 and

626,480,165,025 = (626480+165025)2 = 791,5052 and 208495+791505 = 1,000,000.

629,072

[Math.]  The 2nd known amicable/sociable number chain: 14316 → 19116 → 31704 → 47616 → 83328 → 177792 → 295488 → 629072 → 589786 → 294896 → 358336 → 418904 → 366556 → 274924 → 275444 → 243760 → 376736 → 381028 → 285778 → 152990 → 122410 → 97946 → 48976 → 45946 → 22976 → 22744 → 19916 → 17716 → 14316. (of 28 links, currently the longest, found by Poulet, 1918).

629,137

[Math.]  A prime number truncated from the largest known left-truncatable prime number 357,686,312,646,216,567,629,137.