640

639 ← 640 → 641
The prime factor resolution	27*5
The binary scale	1010000000
六進法	2544
Octal system	1200
Duodecimal system	454
Hexadecimal notation	280
十八進法	1HA
Vigesimal system	1C0
Roman numeral	DCXL
The Chinese numerals	640
Larger section of a village	640
Ancient calculator

640 (ろっぴゃくよんじゅう) is one of the natural number and is a number before 641 in 639 nexts.

Property

• It is a composite number, and the divisor is 1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640.
  • The sum of divisor is 1530.
• It is the number of the 156th ハーシャッド. 630, the next are 644 before one.
  • When I assumed 10 the basis, it is the number of the sixth ハーシャッド. 550, the next are 730 before one.
• 1/640 = 0.0015625
• The number that the sum of divisor becomes 640 is three. (399, 553, 589) is the 19th number to be able to express in three sums of divisor. 620, the next are 660 before one.
• The sum of members is the 54th number to become 10. 631, the next are 703 before one.

I a related thing to others 640

• A wall of 640KB in the MS-DOS environment.
• The number of the wide dots of PC-9801 standard screen and the VGA screen.
• Ferrari 640

Allied item

• Christian era 640 years
  • The 640s

It is acquired by "https://ja.wikipedia.org/w/index.php?title=640&oldid=63290100"

This article is taken from the Japanese Wikipedia 640

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