Properties of the Number 72216

Seventy-Two Thousand Two Hundred Sixteen

Basics

Value: 72215 → 72216 → 72217

Parity: even

Prime: No

Previous Prime: 72211

Next Prime: 72221

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ³ × 3 ² × 17 × 59

Divisors: 1, 2, 3, 4, 6, 8, 9, 12, 17, 18

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10001101000011000

Octal: 215030

Duodecimal: 35960

Hexadecimal: 11a18

Square: 5215150656

Square Root: 268.7303481187043

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Truncated tetrahedral numbers: a(n) = (1/6)*(n+1)*(23·n² + 19·n + 6). A5906

a(n) = ∑_{k=0..floor(2·n/3)} binomial(k+2,2) * binomial(k,2·n-3·k). A392269

Expansion of 1/(1-x⁴-x⁵-x⁶-x⁷-x⁸-x⁹-x¹⁰-x¹¹). A17833

Enneagonal numbers divisible by 9. A117796

Consider the Reverse and Add! problem (cf. A001127); of all the n-digit numbers N which eventually reach a palindrome, pick that number N which takes the greatest number of steps to converge (in case of a tie, pick the smallest N); sequence gives values of N. A72216