16,428
16,428 is a composite number, even.
16,428 (sixteen thousand four hundred twenty-eight) is an even 5-digit number. It is a composite number with 18 divisors, and factors as 2² × 3 × 37². Its proper divisors sum to 22,968, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x402C.
Interestingness
Properties
- Parity
- Even
- Digit count
- 5
- Digit sum
- 21
- Digit product
- 384
- Digital root
- 3
- Palindrome
- No
- Bit width
- 15 bits
- Reversed
- 82,461
- Recamán's sequence
- a(17,856) = 16,428
- Square (n²)
- 269,879,184
- Cube (n³)
- 4,433,575,234,752
- Divisor count
- 18
- σ(n) — sum of divisors
- 39,396
- φ(n) — Euler's totient
- 5,328
- Sum of prime factors
- 81
Primality
Prime factorization: 2 2 × 3 × 37 2
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√16,428 = [128; (5, 1, 4, 1, 1, 1, 1, 1, 2, 1, 84, 1, 2, 1, 1, 1, 1, 1, 4, 1, 5, 256)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- sixteen thousand four hundred twenty-eight
- Ordinal
- 16428th
- Binary
- 100000000101100
- Octal
- 40054
- Hexadecimal
- 0x402C
- Base64
- QCw=
- One's complement
- 49,107 (16-bit)
- Scientific notation
- 1.6428 × 10⁴
- As a duration
- 16,428 s = 4 hours, 33 minutes, 48 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓂍𓆼𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓎆𓎆𓏺𓏺𓏺𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵ιϛυκηʹ
- Mayan (base 20)
- 𝋢·𝋡·𝋡·𝋨
- Chinese
- 一萬六千四百二十八
- Chinese (financial)
- 壹萬陸仟肆佰貳拾捌
Digit at this position in famous constants
- π — Pi (π)
- Digit 16,428 = 8
- e — Euler's number (e)
- Digit 16,428 = 9
- φ — Golden ratio (φ)
- Digit 16,428 = 8
- √2 — Pythagoras's (√2)
- Digit 16,428 = 8
- ln 2 — Natural log of 2
- Digit 16,428 = 6
- γ — Euler-Mascheroni (γ)
- Digit 16,428 = 0
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 16428, here are decompositions:
- 7 + 16421 = 16428
- 11 + 16417 = 16428
- 17 + 16411 = 16428
- 47 + 16381 = 16428
- 59 + 16369 = 16428
- 67 + 16361 = 16428
- 79 + 16349 = 16428
- 89 + 16339 = 16428
Showing the first eight; more decompositions exist.
UTF-8 encoding: E4 80 AC (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.64.44.
- Address
- 0.0.64.44
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.64.44
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 16,428 Hz is closest to:
- Concert pitch (A4 = 440 Hz): C10 (16744 Hz, -33¢)
- Scientific pitch (C4 = 256 Hz): C10 (16384 Hz, +5¢)
- Baroque pitch (A4 = 415 Hz): C♯10 (16731.8 Hz, -32¢)
The digit sequence 16428 first appears in π at position 328,895 of the decimal expansion (the 328,895ordinal-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
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.