155,720
155,720 is a composite number, even.
155,720 (one hundred fifty-five thousand seven hundred twenty) is an even 6-digit number. It is a composite number with 32 divisors, and factors as 2³ × 5 × 17 × 229. Its proper divisors sum to 216,880, more than the number itself, making it an abundant number. Written other ways, in hexadecimal, 0x26048.
Interestingness
Properties
- Parity
- Even
- Digit count
- 6
- Digit sum
- 20
- Digit product
- 0
- Digital root
- 2
- Palindrome
- No
- Bit width
- 18 bits
- Reversed
- 27,551
- Recamán's sequence
- a(206,424) = 155,720
- Square (n²)
- 24,248,718,400
- Cube (n³)
- 3,776,010,429,248,000
- Divisor count
- 32
- σ(n) — sum of divisors
- 372,600
- φ(n) — Euler's totient
- 58,368
- Sum of prime factors
- 257
Primality
Prime factorization: 2 3 × 5 × 17 × 229
Divisors & multiples
Sums & aliquot sequence
Continued fraction of √n
√155,720 = [394; (1, 1, 1, 1, 2, 3, 4, 1, 13, 1, 1, 6, 197, 6, 1, 1, 13, 1, 4, 3, 2, 1, 1, 1, …)]
Period length 26 — the block in parentheses repeats forever.
Representations
- In words
- one hundred fifty-five thousand seven hundred twenty
- Ordinal
- 155720th
- Binary
- 100110000001001000
- Octal
- 460110
- Hexadecimal
- 0x26048
- Base64
- AmBI
- One's complement
- 4,294,811,575 (32-bit)
- Scientific notation
- 1.5572 × 10⁵
- As a duration
- 155,720 s = 1 day, 19 hours, 15 minutes, 20 seconds
As an angle
Historical numeral systems
- Babylonian (base 60)
- 𒌋𒌋𒌋𒌋𒁹𒁹𒁹 𒌋𒁹𒁹𒁹𒁹𒁹 𒌋𒌋
- Egyptian hieroglyphic
- 𓆐𓂍𓂍𓂍𓂍𓂍𓆼𓆼𓆼𓆼𓆼𓍢𓍢𓍢𓍢𓍢𓍢𓍢𓎆𓎆
- Greek (Milesian)
- ͵ρνεψκʹ
- Mayan (base 20)
- 𝋳·𝋩·𝋦·𝋠
- Chinese
- 一十五萬五千七百二十
- Chinese (financial)
- 壹拾伍萬伍仟柒佰貳拾
Also seen as
Goldbach's conjecture says every even integer greater than 2 is the sum of two primes. For 155720, here are decompositions:
- 3 + 155717 = 155720
- 13 + 155707 = 155720
- 31 + 155689 = 155720
- 67 + 155653 = 155720
- 127 + 155593 = 155720
- 139 + 155581 = 155720
- 151 + 155569 = 155720
- 163 + 155557 = 155720
Showing the first eight; more decompositions exist.
UTF-8 encoding: F0 A6 81 88 (4 bytes).
As an unsigned 32-bit integer, this is the IPv4 address 0.2.96.72.
- Address
- 0.2.96.72
- Class
- reserved
- IPv4-mapped IPv6
- ::ffff:0.2.96.72
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 155,720 and was likely granted around 1873.
Patent numbers below 100,000 are excluded as too ambiguous; modern numbering currently reaches roughly 12.5 million.
The digit sequence 155720 first appears in π at position 849,783 of the decimal expansion (the 849,783ordinal-suffix:rd 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
- Mayan numerals — Vigesimal dots-and-bars with a shell zero — one of the earliest true zeros.