087

087 is a decimal numeral that denotes the value 87 when leading zeros are not significant. It may appear in contexts that require fixed-width numbering, such as identifiers or codes.

In mathematics, 87 is an odd composite number. Its prime factorization is 3 × 29. The sum of its digits is 15, with a digital root of 6. In various bases, 87 is represented as binary 1010111 and hexadecimal 57. In Roman numerals, it is written as LXXXVII.

In science, 87 is the atomic number of francium, the heaviest known alkali metal, with the chemical symbol Fr. Francium is extremely rare and highly radioactive; all of its isotopes are unstable. It was discovered in 1939 by Marguerite Perey and is named after France. Because of its short-lived isotopes, francium occurs only in trace amounts in nature and has limited practical uses, existing mainly for research purposes.

In computing, a leading zero can indicate octal notation in some programming languages; however, 087 is not a valid octal literal in most systems because octal digits range from 0 to 7, making the digit 8 illegal in that context.

Contextual usage: the sequence 087 can appear as part of identifiers, codes, or numbering schemes and has different meanings depending on the system in which it is used.