8,428
8,428 is a composite number, even.
8,428 (eight thousand four hundred twenty-eight) is an even 4-digit number. It is a composite number with 18 divisors, and factors as 2² × 7² × 43. Its proper divisors sum to 9,128, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x20EC.
Interestingness
Properties
- Parity
- Even
- Digit count
- 4
- Digit sum
- 22
- Digit product
- 512
- Digital root
- 4
- Palindrome
- No
- Bit width
- 14 bits
- Reversed
- 8,248
- Recamán's sequence
- a(2,875) = 8,428
- Square (n²)
- 71,031,184
- Cube (n³)
- 598,650,818,752
- Divisor count
- 18
- σ(n) — sum of divisors
- 17,556
- φ(n) — Euler's totient
- 3,528
- Sum of prime factors
- 61
Primality
Prime factorization: 2 2 × 7 2 × 43
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√8,428 = [91; (1, 4, 9, 2, 6, 3, 14, 1, 60, 3, 1, 2, 1, 2, 2, 19, 1, 44, 1, 19, 2, 2, 1, 2, …)]
Period length 36 — the block in parentheses repeats forever.
Representations
- In words
- eight thousand four hundred twenty-eight
- Ordinal
- 8428th
- Binary
- 10000011101100
- Octal
- 20354
- Hexadecimal
- 0x20EC
- Base64
- IOw=
- One's complement
- 57,107 (16-bit)
- Scientific notation
- 8.428 × 10³
- As a duration
- 8,428 s = 2 hours, 20 minutes, 28 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒌋 𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ηυκηʹ
- Mayan (base 20)
- 𝋡·𝋡·𝋡·𝋨
- Chinese
- 八千四百二十八
- Chinese (financial)
- 捌仟肆佰貳拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 8,428 = 3
- e — Euler's number (e)
- Digit 8,428 = 3
- φ — Golden ratio (φ)
- Digit 8,428 = 8
- √2 — Pythagoras's (√2)
- Digit 8,428 = 5
- ln 2 — Natural log of 2
- Digit 8,428 = 8
- γ — Euler-Mascheroni (γ)
- Digit 8,428 = 9
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 8428, here are decompositions:
- 5 + 8423 = 8428
- 41 + 8387 = 8428
- 59 + 8369 = 8428
- 131 + 8297 = 8428
- 137 + 8291 = 8428
- 191 + 8237 = 8428
- 197 + 8231 = 8428
- 257 + 8171 = 8428
Showing the first eight; more decompositions exist.
UTF-8 encoding: E2 83 AC (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.32.236.
- Address
- 0.0.32.236
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.32.236
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 8,428 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C9 (8372 Hz, +12¢)
- Scientific pitch (C4 = 256 Hz): C9 (8192 Hz, +49¢ — about midway to C♯9)
- Baroque pitch (A4 = 415 Hz): C♯9 (8365.9 Hz, +13¢)
The digit sequence 8428 first appears in π at position 29,480 of the decimal expansion (the 29,480ordinal-suffix:th 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.