Properties of the Number 82621

Eighty-Two Thousand Six Hundred Twenty-One

Basics

Value: 82620 → 82621 → 82622

Parity: odd

Prime: No

Previous Prime: 82619

Next Prime: 82633

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 7 × 11 × 29 × 37

Divisors: 1, 7, 11, 29, 37, 77, 203, 259, 319, 407

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10100001010111101

Octal: 241275

Duodecimal: 3B991

Hexadecimal: 142bd

Square: 6826229641

Square Root: 287.43868911473976

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

Doubly triangular numbers: a(n) = n*(n+1)*(n²+n+2)/8. A2817

Tree generated by the triangular numbers: a(1) = 1; a(2n) = nontriangular(a(n)), a(2n+1) = triangular(a(n+1)), where triangular = A000217, nontriangular = A014132. A183079

Iterated triangular numbers with seed 7. A50548

a(n) = A185128(n) - A185129(n). A185253

Triply triangular numbers. A64322

9-gonal (or nonagonal) triangular numbers. A48909

Triangular numbers m such that A040115(m) is also triangular. A87597

Largest n-digit term of A087597, or 0 if no such number exists. A87600

Numbers n for which φ(n)=σ(n'), where φ is the Euler totient function, σ is the sum of divisors and n' the arithmetic derivative of n. A189057

Integers k such that A000330(k) is the sum of 2 positive cubes. A269842