Properties of the Number 6690

Six Thousand Six Hundred Ninety

Basics

Value: 6689 → 6690 → 6691

Parity: even

Prime: No

Previous Prime: 6689

Next Prime: 6691

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 2 × 3 × 5 × 223

Divisors: 1, 2, 3, 5, 6, 10, 15, 30, 223, 446

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101000100010

Octal: 15042

Duodecimal: 3A56

Hexadecimal: 1a22

Square: 44756100

Square Root: 81.79242018671412

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

Numbers that are the sum of 5 positive 7th powers. A3372

The number of vertices formed when every pair of n points, placed at the vertices of a regular n-gon, are connected by a circle and where the points lie at the ends of the circle's diameter. A358746

Values of m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,3. A64238

Numbers n such that there are equal numbers of 0's and 1's in first n digits of binary representation of π. A39624

Square array T(n,k), n >= 0, k >= 0, read by antidiagonals, where T(n,k) is ∑_i=0..n (-2)^n-i*binomial(n,i)*∑_j=0..i binomial(i,j)^k. A328748

Numbers whose set of base 6 digits is {0,5}. A97252

Number of (undirected) paths in the graph C₅ X C_n. A358869

Averages of twin prime pairs which are a sum of averages of two consecutive twin prime pairs. A160916

Constant term in the expansion of (-2 + (1 + w) * (1 + x) * (1 + y) * (1 + z) + (1 + 1/w) * (1 + 1/x) * (1 + 1/y) * (1 + 1/z))ⁿ. A328751

Constant term in the expansion of (-2 + ∏_k=1..n (1 + x_k) + ∏_k=1..n (1 + 1/x_k))ⁿ. A328814