28,420
28,420 is a composite number, even.
28,420 (twenty-eight thousand four hundred twenty) is an even 5-digit number. It is a composite number with 36 divisors, and factors as 2² × 5 × 7² × 29. Its proper divisors sum to 43,400, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x6F04.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 16
- Digit product
- 0
- Digital root
- 7
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 2,482
- Recamán's sequence
- a(80,300) = 28,420
- Square (n²)
- 807,696,400
- Cube (n³)
- 22,954,731,688,000
- Divisor count
- 36
- σ(n) — sum of divisors
- 71,820
- φ(n) — Euler's totient
- 9,408
- Sum of prime factors
- 52
Primality
Prime factorization: 2 2 × 5 × 7 2 × 29
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√28,420 = [168; (1, 1, 2, 1, 1, 6, 3, 2, 1, 3, 2, 6, 2, 3, 1, 2, 3, 6, 1, 1, 2, 1, 1, 336)]
Period length 24 — the block in parentheses repeats forever.
Representations
- In words
- twenty-eight thousand four hundred twenty
- Ordinal
- 28420th
- Binary
- 110111100000100
- Octal
- 67404
- Hexadecimal
- 0x6F04
- Base64
- bwQ=
- One's complement
- 37,115 (16-bit)
- Scientific notation
- 2.842 × 10⁴
- As a duration
- 28,420 s = 7 hours, 53 minutes, 40 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋
- Egyptian hieroglyphic
- 𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵κηυκʹ
- Mayan (base 20)
- 𝋣·𝋫·𝋡·𝋠
- Chinese
- 二萬八千四百二十
- Chinese (financial)
- 貳萬捌仟肆佰貳拾
Digit at this position in famous constants
- π — Pi (π)
- Digit 28,420 = 9
- e — Euler's number (e)
- Digit 28,420 = 1
- φ — Golden ratio (φ)
- Digit 28,420 = 3
- √2 — Pythagoras's (√2)
- Digit 28,420 = 9
- ln 2 — Natural log of 2
- Digit 28,420 = 5
- γ — Euler-Mascheroni (γ)
- Digit 28,420 = 4
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 28420, here are decompositions:
- 11 + 28409 = 28420
- 17 + 28403 = 28420
- 71 + 28349 = 28420
- 101 + 28319 = 28420
- 113 + 28307 = 28420
- 131 + 28289 = 28420
- 137 + 28283 = 28420
- 191 + 28229 = 28420
Showing the first eight; more decompositions exist.
UTF-8 encoding: E6 BC 84 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.111.4.
- Address
- 0.0.111.4
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.111.4
Unspecified address (0.0.0.0/8) — "this network" placeholder.
The digit sequence 28420 first appears in π at position 264,442 of the decimal expansion (the 264,442ordinal-suffix:nd digit after the integer 3).
Search range: the first 1,000,000 fractional digits of π. Any 6-digit-or-shorter string is virtually guaranteed to appear in there — the more interesting signal is the position.
Related reading
- Egyptian hieroglyphic numerals — Seven hieroglyphs for every power of ten, from a single stroke to a million.