Properties of the Number 2628

Two Thousand Six Hundred Twenty-Eight

Basics

Value: 2627 → 2628 → 2629

Parity: even

Prime: No

Previous Prime: 2621

Next Prime: 2633

Digit Sum: 18

Digital Root: 9

Palindrome: No

Factorization: 2 ² × 3 ² × 73

Divisors: 1, 2, 3, 4, 6, 9, 12, 18, 36, 73

Polygonal

Triangular: Yes

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 101001000100

Octal: 5104

Duodecimal: 1630

Hexadecimal: a44

Square: 6906384

Square Root: 51.264022471905186

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

Second hexagonal numbers: a(n) = n*(2·n + 1). A14105

Number of integer compositions of n with all distinct run-sums. A353850

e-perfect numbers: numbers k such that the sum of the e-divisors (exponential divisors) of k equals 2·k. A54979

Coreful perfect numbers: numbers k such that csigma(k) = 2·k, where csigma(k) is the sum of the coreful divisors of k (A057723). A307958

Triangle read by rows: T(n,k) = number of lattice paths from (0,0) to (n,k) that do not go below the line y=0 and consist of steps U=(1,1), D=(1,-1) and three types of steps H=(1,0) (left factors of 3-Motzkin steps). A91965

a(n) = p*(p-1)/2 for p = prime(n). A8837

a(n) = 2·n*(4·n + 1). A33585

Where 3ⁿ occurs in n-almost primes, starting at a(0)=1. A78843

Staggered diagonal of triangular spiral in A051682. A81266

Years in which there are five Fridays in the month of February. A141287