Numbers 2,500,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

2,000,000 2,100,0002,200,0002,300,0002,400,000

2,500,0002,600,0002,700,0002,800,0002,900,000

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2,500,001

[Math.]  The number of 0’s that the factorial (10,000,000!) ends in.

2,500,001 = [[10,000,000/5]] +…+ [[10,000,000/510]],

where [[x]] is the floor function of x, i.e. which is the largest integer less than x (or the integral part of x).

 

2,505,600

[Calendar]  The number of seconds in February of a leap year.

 

2,538,459

[Math.]  076,923×33 = 2,538,459 and 2+538,459 = 538,461, a digit-rotation of 153,846 = 076,923×2.

 

2,547,216

[Math.]  Sum of the first 56 cube numbers:

13+23+…+553+563 = 2,547,216 = (1+2+…+55+56)2 = 15962.

 

2,551,466

[Calendar]  A synodic month is the interval between full moons, 2,551,466.2176 seconds = 29 days 12 h 4 m 26.22 s. A sidereal month is the time interval for the Moon to complete one orbit around the Earth, relative a fixed star, 2,360,591.5104 seconds = 27 days 7 h 43 m 11.51 s.

 

2,558,815

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

2,558,815 = 4062+4072+…+4192+4202 = 4212+4222+…+4332+4342.

 

2,571,426

[Math.]  142,857×18 = 2,571,426 and 2+571,426 = 571,428, a digit-rotation of 142,857.

 

2,576,816

[Math.]  A product of two reversal numbers: 2,576,816×6,186,752 = 251683.

 

2,589,988

[Measure]  The number of square meters in a square mile.

U.S. customary units for area measures: 1 acre = 160 square rods = 4,840 square yards = 43,560 square feet = 6,272,640 square inches = 4046.8564224 m2 & 1 square mile (1 section) = 640 acres = 2,589,988.11 m2 = 2.59 km2 = 259 hectares & 1 hectare = 2.471 acres = 10,000 m2 & 1 township = 36 square miles.

 

2,592,000

[Calendar]  The number of seconds in a 30-day month.