Properties of the Number 6670

Six Thousand Six Hundred Seventy

Basics

Value: 6669 → 6670 → 6671

Parity: even

Prime: No

Previous Prime: 6661

Next Prime: 6673

Digit Sum: 19

Digital Root: 1

Palindrome: No

Factorization: 2 × 5 × 23 × 29

Divisors: 1, 2, 5, 10, 23, 29, 46, 58, 115, 145

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: Yes

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101000001110

Octal: 15016

Duodecimal: 3A3A

Hexadecimal: 1a0e

Square: 44488900

Square Root: 81.67006795638167

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

Centered 9-gonal (also known as nonagonal or enneagonal) numbers. Every third triangular number, starting with a(1)=1. A60544

Number of atoms in a decahedron with n shells. A4068

a(n) = 2·n*(4·n - 1). A14635

Squarefree integers m > 1 such that if prime p divides m, then the sum of the base p digits of m is at least p. A324315

T(n,k)=Number of length n+3 0..k arrays with every four consecutive terms having the maximum of some two terms equal to the minimum of the remaining two terms. A249707

a(n) = A052217(n)/3. A88405

Number of integer partitions y of n whose rank Sum_i 2^y_i-1 is prime. A372688

Fourth column (m=3) of (1,6)-Pascal triangle A096956. A96957

Number of unlabeled (and unrooted) trees on 2n nodes with a bicentroid. A102911

a(n) is the conjectured highest power of n which has no four identical digits in succession. A216065