Properties of the Number 7720

Seven Thousand Seven Hundred Twenty

Basics

Value: 7719 → 7720 → 7721

Parity: even

Prime: No

Previous Prime: 7717

Next Prime: 7723

Digit Sum: 16

Digital Root: 7

Palindrome: No

Factorization: 2 ³ × 5 × 193

Divisors: 1, 2, 4, 5, 8, 10, 20, 40, 193, 386

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1111000101000

Octal: 17050

Duodecimal: 4574

Hexadecimal: 1e28

Square: 59598400

Square Root: 87.86353054595519

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 k such that k² divides 9^k - 1. A127101

a(n) is the smallest m for which 3^m contains n consecutive identical digits. A215727

Numbers k such that k³ divides 9^k² - 1. A177909

Number of subsets of {1,..,n} of cardinality >= 2 such that the elements of each counted subset are pairwise coprime. A276187

Least positive power of 3 having exactly n consecutive 1's in its decimal representation. A131552

Four times the sum of all divisors of all positive integers <= n. A243980

Triangle read by rows: T(n,k) is the number of unoriented colorings of the edges of a regular n-dimensional simplex using exactly k colors. Row n has (n+1)*n/2 columns. A327088

Partial sums of A294016. A294017

Expansion of ∏_k=1..10 (1+x^2·k-1)/(1-x^2·k). A316722

Starts of runs of 5 consecutive even numbers that are all totient numbers (A002202). A333022