What is 90?

• The number 90 is an even composite number.
• It is the sum of the first nine consecutive numbers (1+2+3+4+5+6+7+8+9).
• In Roman numerals, 90 is represented as XC.
• 90 is a common reference point in math and science, such as in the Fahrenheit and Celsius temperature scales where 90 degrees is considered very hot.
• In religion, Psalm 90 is a well-known biblical passage.
• The number 90 has significance in popular culture, such as being the number of minutes in a typical Hollywood movie screenplay.
• It is the atomic number of thorium, a radioactive metal element.
• 90 is the international dialing code for India.