35 (thirty-five) is the natural number following 34 and preceding 36.

In mathematics

It is the sum of the first five triangular numbers, making it a tetrahedral number. It is also a centered cube number.

There are 35 hexominos, the polyominos made from 6 squares. 35 is a pentagonal number.

35 is a highly cototient number, since there are more solutions to the equation x - φ(x) = 35 than there are for any other integers below it except 1.

In science

• The atomic number of bromine

In astronomy,

Messier object M35, a magnitude 5.5 open cluster in the constellation Gemini

The New General Catalogue object (http://www.ngcic.org/) NGC 35, a galaxy in the constellation Cetus

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -1870 July 25 and ended on -373 January 9. The duration of Saros series 35 was 1496.5 years, and it contained 84 solar eclipses.

The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -1550 May 14 and ended on -252 July 1. The duration of Saros series 35 was 1298.1 years, and it contained 73 lunar eclipses.

In other fields

35 is also:

• In years of marriage, the coral wedding anniversary.
• The designation of Interstate 35, a freeway that runs from Texas to Minnesota.
• Historical years: 35 A.D., 35 B.C., or 1935
• The minimum age (in years) of candidates for election to the position of President of the United States or President of Ireland.