Properties of the Number 67721

Sixty-Seven Thousand Seven Hundred Twenty-One

Basics

Value: 67720 → 67721 → 67722

Parity: odd

Prime: No

Previous Prime: 67709

Next Prime: 67723

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 241 × 281

Divisors: 1, 241, 281, 67721

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10000100010001001

Octal: 204211

Duodecimal: 33235

Hexadecimal: 10889

Square: 4586133841

Square Root: 260.2325882744127

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

Quasi-Carmichael numbers to exactly three bases. A257753

Semiprimes k = pq such that p^k == p (mod k) and q^k == q (mod k). A294169

Strong pseudoprimes to base 40. A20266

Strong pseudoprimes to base 61. A20287

An L-tile is a 2 X 2 square with the upper 1 X 1 subsquare removed; no rotations are allowed. a(n) = number of tilings of a 4 X n rectangle using tiles that are either 1 X 1 squares or L-tiles. A25234

Number of (6+1) X (n+1) 0..1 arrays with every 2 X 2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically. A258559

Expansion of ∑_k>=0 x^k / ∏_j=1..k (1 + j·x^j). A306702

a(n) = ((n²+1)³) - s, where s is the nearest square to (n²+1)³. A233149

Least number k such that k (k + n) is a perfect square, or 0 if impossible. A67721

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