70,000

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

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, triangular number, and hexagonal number.

73000 to 73999

 * 73296 = is the smallest number n, for which n&minus;3, n&minus;2, n&minus;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, Markov number
 * 75175 = number of partitions of 44
 * 75361 = Carmichael number

76000 to 76999

 * 76084 = amicable number with 63020
 * 76424 = tetranacci number

77000 to 77999

 * 77777 = repdigit
 * 77778 = Kaprekar number

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.