68 (number)

68 (number)
68
Cardinal sixty-eight
Ordinal 68th
(sixty-eighth)
Factorization 2^2 \cdot 17
Divisors 1, 2, 4, 17, 34, 68
Roman numeral LXVIII
Binary 10001002
Octal 1048
Duodecimal 5812
Hexadecimal 4416

68 (sixty-eight) is the natural number following 67 and preceding 69.

Contents

In mathematics

Sixty-eight is a nontotient. It is also a Perrin number, preceded in the sequence by 29, 39, 51 (it is the sum of the first two mentioned). It is also a Happy number.

In normal distribution, 68% of values are within one standard deviation from the mean; see 68-95-99.7 rule.

In science

Astronomy

  • The Saros number of the solar eclipse series which began on -626 March 16 and ended on 685 August. The duration of Saros series 68 was 1280.1 years, and it contained 72 solar eclipses.
  • The Saros number of the lunar eclipse series which began on -613 July 3 and ended on 685 August. The duration of Saros series 68 was 1298.1 years, and it contained 73 lunar eclipses.

In other fields

Sixty-eight is:

Historical years

68 A.D., 68 B.C., 1968, 2068, etc.


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