Numbers 78,000s

A page of the Numeropedia - the Special Encyclopedia of Numbers

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78,071

[Zip]  U.S. Postal Zip Code: Three Rivers, Texas 78071.

78,072

[Math.]  780722 = 6,095,237,184, a square number using each of 10 digits 0-9 once. (The 57th of 87 such numbers).

78,125

[Math.]  A power of 10 that can be represented as the product of 2 numbers, which have no digit 0: 10,000,000 = 27×57 = 128×78,125.

78,133

[Math.]  78133 = 23+57.

78,357

[Zip]  U.S. Postal Zip Code:  Seven Sisters, Texas 78357.

78,376

[Math.]  78376 = 23+35+57.

78,453

[Math.]  784532 = 6,154,873,209, a square number using each of 10 digits 0-9 once. (The 58th of 87 such numbers). The 66th such number is 85743.

78,498

[Math.]  The number of prime numbers less than 1,000,000.

78,557

[Math.]  The smallest-known Sierpinski number of 2nd kind, i.e., the positive odd number k, such that the number k×2n+1 is composite, for every integer n ³ 1.

78,732

[Zip]  U.S. Postal Zip Code: Four Corners, Texas 78732.

78,901

[Math.]  One of only three 5-digit prime numbers whose digits are consecutive (including digit 0). The other 2 such prime numbers are: 76,543 and 10,987.

78,961

[Math.]  Four square numbers using the same digits: 1332 = 17689, 1372 = 18769, 2812 = 78961 and 2862 = 81796.

78nnn

[Zip]  U.S. Postal Zip Codes of Texas: 75nnn-79nnn and 885nn.