36

Number
$36$ (thirty-six) is:


 * $2^2 \times 3^2$


 * The $3$rd of three $2$-digit integers divisible by both the sum and product of its digits:
 * $36 = \left({3 + 6}\right) \times 4 = \left({3 \times 6}\right) \times 2$


 * The $6$th square number after $1$, $4$, $9$, $16$, $25$:
 * $36 = 6 \times 6$


 * The $8$th triangular number after $1$, $3$, $6$, $10$, $15$, $21$, $28$:
 * $36 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 = \dfrac {8 \times \left({8 + 1}\right)} 2$


 * The $2$nd number after $1$ to be both square and triangular:
 * $36 = 6^2 = \dfrac {8 \times \left({8 + 1}\right)} 2$


 * The sum of the first $3$ cubes:
 * $36 = 1^3 + 2^3 + 3^3$


 * The $6$th abundant number after $12$, $18$, $20$, $24$, $30$:
 * $1 + 2 + 3 + 4 + 6 + 9 + 12 + 18 = 55 > 36$


 * The $7$th highly composite number after $1$, $2$, $4$, $6$, $12$, $24$:
 * $\tau \left({36}\right) = 9$


 * The $14$th highly abundant number after $1$, $2$, $3$, $4$, $6$, $8$, $10$, $12$, $16$, $18$, $20$, $24$, $30$:
 * $\sigma \left({36}\right) = 91$


 * The $7$th superabundant number after $1$, $2$, $4$, $6$, $12$, $24$:
 * $\dfrac {\sigma \left({36}\right)} {36} = \dfrac {91} {36} = 2 \cdotp 52 \dot 7$


 * The $8$th semiperfect number after $6$, $12$, $18$, $20$, $24$, $28$, $30$:
 * $36 = 3 + 6 + 9 + 18$


 * The $9$th powerful number after $1$, $4$, $8$, $9$, $16$, $25$, $27$, $32$


 * The $13$th Ulam number after $1$, $2$, $3$, $4$, $6$, $8$, $11$, $13$, $16$, $18$, $26$, $28$:
 * $36 = 8 + 28$


 * The $20$th after $1$, $2$, $4$, $5$, $6$, $8$, $9$, $12$, $13$, $15$, $16$, $17$, $20$, $24$, $25$, $27$, $28$, $32$, $35$ of the $24$ positive integers which cannot be expressed as the sum of distinct non-pythagorean primes.


 * $35$ and $4374$ have the same prime factors between them as $36$ and $4375$, that is: $2$, $3$, $5$ and $7$.


 * The $26$th integer $n$ such that $2^n$ contains no zero in its decimal representation:
 * $2^{36} = 68 \, 719 \, 476 \, 736$


 * The $7$th positive integer $n$ after $5$, $11$, $17$, $23$, $29$, $30$ such that no factorial of an integer can end with $n$ zeroes.


 * The $14$th Zuckerman number after $1$, $2$, $3$, $4$, $5$, $6$, $7$, $8$, $9$, $11$, $12$, $15$, $24$:
 * $36 = 2 \times 18 = 2 \times \left({3 \times 6}\right)$


 * The $18$th harshad number after $1$, $2$, $3$, $4$, $5$, $6$, $7$, $8$, $9$, $10$, $12$, $18$, $20$, $21$, $24$, $27$, $30$:
 * $36 = 4 \times 9 = 4 \times \left({3 + 6}\right)$

Also see

 * Prime Factors of 35, 36, 4734 and 4735