72 (Number)
72
is the
natural number
following
71
and preceding
73
.
Cardinal
seventy-two
Ordinal
72nd (seventy-second)
Factorization
2^3 \cdot 3^2
Divisors
2, 3, 4, 6, 8, 9,
12, 18, 24, 36
Roman numeral
LXXII
Binary
1001000
Hexadecimal
48
In mathematics
Seventy-two
is the sum of four consecutive
primes
(13 + 17 + 19 + 23), as well as the sum of six consecutive primes (5 + 7 + 11 + 13 + 17 + 19). 72 is a
Harshad number
and a
pronic number
. In normal space, the exterior angles of an equilateral
pentagon
measure 72 degrees each. There are 17 solutions to the equation
φ
(
x
) = 72, more than any integer below 72, making it a
highly totient number
.
In science
The
atomic number
of
hafnium
In
astronomy
,
Messier object
M72
, a
magnitude
10.0
globular cluster
in the
constellation
Aquarius
The
New General Catalogue
object
NGC 72
, a magnitude 13.5
barred spiral galaxy
in the constellation
Andromeda
The
Saros
number
of the
solar eclipse
series which began on
-727
August 16
and ended on
752
January 21
. The duration of Saros series 72 was 1478.1 years, and it contained 83 solar eclipses.
The Saros
number
of the
lunar eclipse
series which began on
-407
June 5
and ended on
891
July 25
. The duration of Saros series 72 was 1298.1 years, and it contained 73 lunar eclipses.
In other fields
Seventy-two
is also:
The number of
hours
in three days.
The total number of books in the
Holy Bible
in the
Catholic
version if the
Book of Lamentations
is considered part of the
Book of Jeremiah
.
In dpi, the standard resolution of an
Apple Macintosh
screen.
The number of the
French department
Sarthe
.
The designation of
USA
Interstate 72
, a freeway that runs from
Missouri
to
Illinois
.
The registry of the U.S. Navy's nuclear aircraft carrier
USS Abraham Lincoln (CVN-72)
, named after U.S. President
Abraham Lincoln
.
The designation of the Soviet
T-72
tank.
In the movie
The Red Violin
, the lot number of the Bussotti red violin at the DuVal auction house.
The year AD
72
,
72 BC
, or
1972
.
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