2,745
2,745 is a composite number, odd.
2,745 (two thousand seven hundred forty-five) is an odd 4-digit number. It is a composite number with 12 divisors, and factors as 3² × 5 × 61. Written other ways, in Roman numerals it is MMDCCXLV and in binary, 101010111001.
Interestingness
Properties
- Parity
- Odd
- Digit count
- 4
- Digit sum
- 18
- Digit product
- 280
- Digital root
- 9
- Palindrome
- No
- Bit width
- 12 bits
- Reversed
- 5,472
- Recamán's sequence
- a(2,765) = 2,745
- Square (n²)
- 7,535,025
- Cube (n³)
- 20,683,643,625
- Divisor count
- 12
- σ(n) — sum of divisors
- 4,836
- φ(n) — Euler's totient
- 1,440
- Sum of prime factors
- 72
Primality
Prime factorization: 3 2 × 5 × 61
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√2,745 = [52; (2, 1, 1, 4, 1, 10, 1, 4, 1, 1, 2, 104)]
Period length 12 — the block in parentheses repeats forever.
Representations
- In words
- two thousand seven hundred forty-five
- Ordinal
- 2745th
- Roman numeral
- MMDCCXLV
- Binary
- 101010111001
- Octal
- 5271
- Hexadecimal
- 0xAB9
- Base64
- Crk=
- One's complement
- 62,790 (16-bit)
- Scientific notation
- 2.745 × 10³
- As a duration
- 2,745 s = 45 minutes, 45 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋𒌋𒌋𒁹𒁹𒁹𒁹𒁹
- Egyptian hieroglyphic
- 𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆𓎆𓎆𓏺𓏺𓏺𓏺𓏺
- Greek (Milesian)
- ͵βψμεʹ
- Mayan (base 20)
- 𝋦·𝋱·𝋥
- Chinese
- 二千七百四十五
- Chinese (financial)
- 貳仟柒佰肆拾伍
Digit at this position in famous constants
- π — Pi (π)
- Digit 2,745 = 2
- e — Euler's number (e)
- Digit 2,745 = 2
- φ — Golden ratio (φ)
- Digit 2,745 = 7
- √2 — Pythagoras's (√2)
- Digit 2,745 = 7
- ln 2 — Natural log of 2
- Digit 2,745 = 8
- γ — Euler-Mascheroni (γ)
- Digit 2,745 = 7
Also seen as
UTF-8 encoding: E0 AA B9 (3 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.0.10.185.
- Address
- 0.0.10.185
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.0.10.185
Unspecified address (0.0.0.0/8) — "this network" placeholder.
Heard as a frequency, 2,745 Hz is closest to:
- Concert pitch (A4 = 440 Hz): F7 (2793.8 Hz, -31¢)
- Scientific pitch (C4 = 256 Hz): F7 (2733.8 Hz, +7¢)
- Baroque pitch (A4 = 415 Hz): F♯7 (2791.8 Hz, -29¢)
The digit sequence 2745 first appears in π at position 23,799 of the decimal expansion (the 23,799ordinal-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°.