70,000

← 69999 70000 70001 →
List of numbers Integers ← 0 10k 20k 30k 40k 50k 60k 70k 80k 90k →
Cardinal	seventy thousand
Ordinal	70000th (seventy thousandth)
Factorization	24 × 54 × 7
Greek numeral	${\displaystyle {\stackrel {\zeta }{\mathrm {M} }}}$
Roman numeral	LXX, lxx
Binary	100010001011100002
Ternary	101200001213
Senary	13000246
Octal	2105608
Duodecimal	3461412
Hexadecimal	1117016

70,000 (seventy thousand) is the natural number that comes after 69,999 and before 70,001. It is a round number.

Selected numbers in the range 70001–79999

70001 to 70999

• 70030 = largest number of digits of π that have been recited from memory

71000 to 71999

• 71656 = pentagonal pyramidal number

72000 to 72999

• 72771 = 3 x 127 x 191, is a sphenic number, ^[1] triangular number, ^[2] and hexagonal number. ^[3]

73000 to 73999

• 73296 = is the smallest number n, for which n−3, n−2, n−1, n+1, n+2, n+3 are all Sphenic number.
• 73440 = 15 × 16 × 17 × 18
• 73712 = number of n-Queens Problem solutions for n = 13
• 73728 = 3-smooth number

74000 to 74999

• 74088 = 42³ = 2³ * 3³ * 7³
• 74353 = Friedman prime
• 74897 = Friedman prime

75000 to 75999

• 75025 = Fibonacci number, ^[4] Markov number ^[5]
• 75175 = number of partitions of 44 ^[6]
• 75361 = Carmichael number ^[7]

76000 to 76999

• 76084 = amicable number with 63020
• 76424 = tetranacci number ^[8]

77000 to 77999

• 77777 = repdigit
• 77778 = Kaprekar number ^[9]

78000 to 78999

• 78125 = 5⁷
• 78163 = Friedman prime
• 78498 = the number of primes under 1,000,000
• 78557 = conjectured to be the smallest Sierpiński number
• 78732 = 3-smooth number

79000 to 79999

• 79507 = 43³

Primes

There are 902 prime numbers between 70000 and 80000.

References

1. Sloane, N. J. A. (ed.). "SequenceA007304(Sphenic numbers: products of 3 distinct primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
2. Sloane, N. J. A. (ed.). "SequenceA000217(Triangular numbers: a(n) = binomial(n+1,2) = n*(n+1)/2 = 0 + 1 + 2 + ... + n)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
3. Sloane, N. J. A. (ed.). "SequenceA000384(Hexagonal numbers: a(n) = n*(2*n-1))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
4. "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
5. "Sloane's A002559 : Markoff (or Markov) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
6. Sloane, N. J. A. (ed.). "SequenceA000041(a(n) is the number of partitions of n (the partition numbers).)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
7. "Sloane's A002997 : Carmichael numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
8. "Sloane's A000078 : Tetranacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.
9. "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-06-16.