104
104 is a composite number, even, a calendar year.
104 (one hundred four) is an even 3-digit number. It is a composite number with 8 divisors, and factors as 2³ × 13. Its proper divisors sum to 106, more than the number itself, making it an abundant number. Written other ways, in Roman numerals it is CIV and in binary, 1101000.
Interestingness
Historical context — 104 AD
Calendar year
Year 104 (CIV) was a leap year starting on Monday of the Julian calendar, the 104th Year of the Anno Domini (AD) designation, the 104th year of the 1st millennium, the 4th year of the 2nd century, and the 5th year of the 100s decade.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
Historical context — 104 BC
Calendar year
Year 104 BC was a year of the pre-Julian Roman calendar.
Excerpt from Wikipedia (en) ↗ · Licensed CC BY-SA 4.0 Read the full article on Wikipedia →
Year facts
- Year type
-
Leap year
Divisible by 4 and not by 100; February has 29 days.
- Days in year
- 366
- ISO weeks
- 52
- Started on
-
Tuesday
January 1, 104
- Ended on
-
Wednesday
December 31, 104
- Friday the 13ths
-
1
One Friday the 13th this year.
- Decade
-
100s
100–109
- Century
-
2nd century
101–200
- Millennium
-
1st millennium
1–1000
- Years ago
-
1,922
1922 years before 2026.
In other calendars
- Hebrew
-
3864 / 3865 AM
Rosh Hashanah falls in September/October.
- Chinese
-
Year of the zodiac:Wood zodiac:Dragon
Sexagenary cycle position 41 of 60. Lunar new year falls in late January / mid-February.
- Buddhist Era
-
647 BE
Counted from the parinirvana of the Buddha (Theravada / Thai / Sri Lankan convention).
- Ethiopian
-
96 / 97 ET
Year boundary at Enkutatash (September 11/12).
- Indian National (Saka)
-
26 / 25 Saka
Indian national calendar; year starts in March.
Properties
Primality
Prime factorization: 2 3 × 13
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√104 = [10; (5, 20)]
Period length 2 — the block in parentheses repeats forever.
Representations
- In words
- one hundred four
- Ordinal
- 104th
- Roman numeral
- CIV
- Binary
- 1101000
- Octal
- 150
- Hexadecimal
- 0x68
- Base64
- aA==
- One's complement
- 151 (8-bit)
- Scientific notation
- 1.04 × 10²
- As a duration
- 104 s = 1 minute, 44 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓍢𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ρδʹ
- Mayan (base 20)
- 𝋥·𝋤
- Chinese
- 一百零四
- Chinese (financial)
- 壹佰零肆
Digit at this position in famous constants
- π — Pi (π)
- Digit 104 = 1
- e — Euler's number (e)
- Digit 104 = 4
- φ — Golden ratio (φ)
- Digit 104 = 7
- √2 — Pythagoras's (√2)
- Digit 104 = 0
- ln 2 — Natural log of 2
- Digit 104 = 0
- γ — Euler-Mascheroni (γ)
- Digit 104 = 6
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 104, here are decompositions:
- 3 + 101 = 104
- 7 + 97 = 104
- 31 + 73 = 104
- 37 + 67 = 104
- 43 + 61 = 104
As an ASCII codepoint, 104 is h. Printable ASCII character h.
As an unsigned 32-bit integer, this is the IPv4 address 0.0.0.104.
- Address
- 0.0.0.104
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.0.104
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 104 Hz is closest to:
- Concert pitch (A4 = 440 Hz): G♯2 (103.8 Hz, +3¢)
- Scientific pitch (C4 = 256 Hz): G♯2 (101.6 Hz, +41¢)
- Baroque pitch (A4 = 415 Hz): A2 (103.8 Hz, +4¢)
As a MIDI note number, 104 is G♯7 (3322.4 Hz at concert pitch).
On the periodic table, atomic number 104 is Rutherfordium (Rf) — period 7.
On an ingredients label, E104 is Quinoline Yellow, a food colour.
Related reading
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.