104 is the natural number following 103 and preceding 105.

Cardinal	one hundred [and] four
Ordinal	104th (one hundred [and] fourth)
Factorization
Roman numeral	CIV
Binary	1101000
Hexadecimal	68

In mathematics

One hundred four is a primitive semiperfect number and a composite number, with its divisors being 2, 4, 8, 13, 26 and 52.

In regular geometry, 104 is the smallest number of unit line segments that can exist in a plane with four of them touching at every vertex.

In science

• The atomic number of rutherfordium.

In astronomy,

Messier object M104, a magnitude 9.5 spiral galaxy in the constellation Virgo, also known as the Sombrero Galaxy

The New General Catalogue object NGC104 , a magnitude 4 globular cluster in the constellation Tucana

Asteroid 104 Klymene

The Saros number of the solar eclipse series which began on 470 April 17 and ended on 1714 May 13. The duration of Saros series 104 was 1244.0 years, and it contained 70 solar eclipses.

The Saros number of the lunar eclipse series which began on 465 July 24 and ended on 1781 October 20. The duration of Saros series 104 was 1316.2 years, and it contained 74 lunar eclipses.

In other fields

104 is also:

• The atomic number of rutherfordium.
• The number of Symphonies written by Joseph Haydn on which numbers are agreed upon (though in fact, he wrote more: see list of symphonies by Joseph Haydn).
• The year AD 104 or 104 BC.