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100,640

100,640 is a composite number, even.

This number doesn't have a permanent NumberWiki page yet — what you see below is computed live. Pages get added to the permanent index when they're notable (years, primes, curated, etc.).
Abundant Number Recamán's Sequence

Properties

Parity
Even
Digit count
6
Digit sum
11
Digital root
2
Palindrome
No
Reversed
46,001
Recamán's sequence
a(255,436) = 100,640
Divisor count
48
σ(n) — sum of divisors
258,552

Primality

Prime factorization: 2 5 × 5 × 17 × 37

Divisors & multiples

All divisors (48)
1 · 2 · 4 · 5 · 8 · 10 · 16 · 17 · 20 · 32 · 34 · 37 · 40 · 68 · 74 · 80 · 85 · 136 · 148 · 160 · 170 · 185 · 272 · 296 · 340 · 370 · 544 · 592 · 629 · 680 · 740 · 1184 · 1258 · 1360 · 1480 · 2516 · 2720 · 2960 · 3145 · 5032 · 5920 · 6290 · 10064 · 12580 · 20128 · 25160 · 50320 · 100640
Aliquot sum (sum of proper divisors): 157,912
Factor pairs (a × b = 100,640)
1 × 100640
2 × 50320
4 × 25160
5 × 20128
8 × 12580
10 × 10064
16 × 6290
17 × 5920
20 × 5032
32 × 3145
34 × 2960
37 × 2720
40 × 2516
68 × 1480
74 × 1360
80 × 1258
85 × 1184
136 × 740
148 × 680
160 × 629
170 × 592
185 × 544
272 × 370
296 × 340
First multiples
100,640 · 201,280 · 301,920 · 402,560 · 503,200 · 603,840 · 704,480 · 805,120 · 905,760 · 1,006,400

Representations

In words
one hundred thousand six hundred forty
Ordinal
100640th
Binary
11000100100100000
Octal
304440
Hexadecimal
0x18920
Base64
AYkg

Also seen as

Goldbach decomposition

Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 100640, here are decompositions:

  • 19 + 100621 = 100640
  • 31 + 100609 = 100640
  • 103 + 100537 = 100640
  • 139 + 100501 = 100640
  • 157 + 100483 = 100640
  • 181 + 100459 = 100640
  • 193 + 100447 = 100640
  • 223 + 100417 = 100640

Showing the first eight; more decompositions exist.

Unicode codepoint
𘤠
Tangut Component-289
U+18920
Other letter (Lo)

UTF-8 encoding: F0 98 A4 A0 (4 bytes).

Lookup U+18920 on Compart ↗ Lookup on FileFormat.Info ↗
Hex color
#018920
RGB(1, 137, 32)
IPv4 address

As an unsigned 32-bit integer, this is the IPv4 address 0.1.137.32.

Address
0.1.137.32
Class
reserved
IPv4-mapped IPv6
::ffff:0.1.137.32

Unspecified address (0.0.0.0/8) — "this network" placeholder.

Possible US patent number

This number falls in the range of US utility patent numbers. If it's a patent, it would be issued as US 100,640 and was likely granted around 1870.

Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.

Look up US100,640 on Google Patents ↗ Look up on USPTO ↗