34 (thirty-four) is the natural number following 33 and preceding 35.
Specifically, 34 is the ninth distinct semiprime, it being the sixth of the form
[2] 34 is the sum of the first two perfect numbers 6 + 28,[3] whose difference is its composite index (22).
[5][6] The sum of all its divisors aside from one equals 53, which is the sixteenth prime number.
There is no solution to the equation φ(x) = 34, making 34 a nontotient.
[7] Nor is there a solution to the equation x − φ(x) = 34, making 34 a noncototient.
[15] There are 34 topologically distinct convex heptahedra, excluding mirror images.