136

136 is a natural number that comes after 135 and before 137. It is even and composite, with prime factorization 2^3 × 17. Its positive divisors are 1, 2, 4, 8, 17, 34, 68, and 136. It is the 16th triangular number, since 16 × 17 / 2 equals 136.

In different bases, 136 is written as 10001000 in binary, 210 in octal, and 0x88 in hexadecimal. In Roman numerals it is CXXXVI. The sum of its digits is 10, and its digital root is 1.

In astronomy, the number 136 is associated with the main-belt asteroid 136 Andromeda, which carries this numeric designation. The number also appears as a year label in historical calendars (136 CE or 136 BCE).

As a multiple of 8 and 17, 136 has divisibility properties common to even composite numbers, but it is not prime, nor a square or cube.