Numbers /28

How rare is 28?

28 scores 801 and sits in the Singular tier — 1 in 5,181 of all supported numbers score this high or higher. Everything below is computed from a complete analysis of all 1,000,001 numbers in range.

Number
28
Singular
Rarity Score
801
Global Percentile
Top 0.02%
Same-length rank
Top 37.8%
Among 90 2-digit numbers
Traits Detected
5

RNGdle.net’s own rarity score. Top 0.02% means that proportion of supported numbers scores at least this high. Every exact number has the same chance of being rolled. Same-length rank keeps the score and compares only numbers with 2 digits, including ties. How this differs from EP · Badge guide

Number DNA
28
Lab Observations · Descriptive Only
2 digitsEven numberZero-freeFirst < last2, 8 appear once

These notes make the number easy to read, but they add no score unless a separately counted rarity signal appears below.

Digit Profile
Length2 digits
Unique digits2
Digit sum10
Odd / even split0 / 2
Digital root1
Mathematical Properties
Composite number
6 divisors
Not a perfect square
Not a perfect cube
Not a palindrome
Rarity Drivers
5 traits detected
Two-digit numberSingular

One of only 90 two-digit numbers in range.

Range · signal frequency

+269
1 in 11,111
Triangular numberExtreme

A sum 1 + 2 + … + k for some k.

Factorization · signal frequency

+189
1 in 707
Digit sum 10Extreme

This number's digits add up to an uncommon total.

Arithmetic · signal frequency

+168
1 in 334
2 distinct digitsExtreme

This number uses an uncommon count of distinct digits.

Repetition · signal frequency

+155
1 in 217
Happy numberDistinct

Iterating the sum of squared digits reaches 1.

Arithmetic · signal frequency

+20
14.31%
Rarity Explanation

Strongest signal: Two-digit number. It appears in 90 supported numbers and contributes +269 after correlation decay.

Why is 28 unusual? Only 0.02% of the 1,000,001 supported numbers receive an equal or higher rarity score. This number falls in the Singular tier. Scoring is grounded in the exact frequency of each detected trait — rarer traits carry more information and contribute more to the score.

Algorithm version 1.1.0

One digit away

One digit, +482 points.

Your number

28

Singular · Top 0.02%

Best one-digit neighbour

21

Singular · Top <0.01%

Position 2: 8 → 1 · +482 points.

Gained: Fibonacci number, Digit sum 3, Binary palindrome, Harshad number, Semiprime.

17 legal neighbours · same digit length · no leading zeros. This describes an alternative number, not the odds of your next roll.

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Similar interesting numbers

Explore a shared pattern, a comparable score, or a mathematical relationship. Every link explains its connection to 28.

Shared patterns

10 Score 1,004Shares happy number and triangular number.91 Score 816Shares happy number and triangular number.8,778 Score 828Shares happy number and triangular number.

Same length, nearby scores

65 Score 805Also 2 digits; 4 points higher.49 Score 797Also 2 digits; 4 points lower.20 Score 758Also 2 digits; 43 points lower.

Mathematical relationships

82 Score 656The decimal digits in reverse order.

Patterns in this number

Each of these has its own page explaining how common the pattern is and why.

Happy Numbers

Square each digit, add them up, repeat. If you eventually reach 1 the number is happy; if not, you fall into a cycle. 19 → 82 → 68 → 100 → 1.

Triangular Numbers

A triangular number counts the dots in a triangle: 1, 3, 6, 10, 15, 21 — each one the running total 1 + 2 + … + k.
Open in the calculator Compare this number Browse all patterns See the rarest numbers