491,640
491,640 is a composite number, even.
491,640 (four hundred ninety-one thousand six hundred forty) is an even 6-digit number. It is a composite number with 64 divisors, and factors as 2³ × 3 × 5 × 17 × 241. Its proper divisors sum to 1,076,520, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x78078.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 24
- Digit product
- 0
- Digital root
- 6
- Palindrome
- No
- Bit width
- 19 bits
- Reversed
- 46,194
- Square (n²)
- 241,709,889,600
- Cube (n³)
- 118,834,250,122,944,000
- Divisor count
- 64
- σ(n) — sum of divisors
- 1,568,160
- φ(n) — Euler's totient
- 122,880
- Sum of prime factors
- 272
Primality
Prime factorization: 2 3 × 3 × 5 × 17 × 241
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√491,640 = [701; (5, 1, 6, 1, 1, 28, 11, 1, 2, 1, 92, 1, 2, 1, 11, 28, 1, 1, 6, 1, 5, 1402)]
Period length 22 — the block in parentheses repeats forever.
Representations
- In words
- four hundred ninety-one thousand six hundred forty
- Ordinal
- 491640th
- Binary
- 1111000000001111000
- Octal
- 1700170
- Hexadecimal
- 0x78078
- Base64
- B4B4
- One's complement
- 4,294,475,655 (32-bit)
- Scientific notation
- 4.9164 × 10⁵
- As a duration
- 491,640 s = 5 days, 16 hours, 34 minutes
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒁹𒁹𒁹𒁹 ·
- Egyptian hieroglyphic
- 𓆐𓆐𓆐𓆐𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓂍𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆
- Greek (Milesian)
- ͵υϟαχμʹ
- Chinese
- 四十九萬一千六百四十
- Chinese (financial)
- 肆拾玖萬壹仟陸佰肆拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 491640, here are decompositions:
- 7 + 491633 = 491640
- 13 + 491627 = 491640
- 29 + 491611 = 491640
- 47 + 491593 = 491640
- 59 + 491581 = 491640
- 101 + 491539 = 491640
- 103 + 491537 = 491640
- 109 + 491531 = 491640
Showing the first eight; more decompositions exist.
As an unsigned 32-bit integer, this is the IPv4 address 0.7.128.120.
- Address
- 0.7.128.120
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.7.128.120
Unspecified address (0.0.0.0/8) — "this network" placeholder.
This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 491,640 and was likely granted around 1893.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
Related reading
- Babylonian numerals — The base-60 cuneiform system that gave us 60 minutes, 60 seconds, and 360°.