784 is a square number: 28 x 28 = 784.
784 is the square of the sum of the first seven integers: (1 + 2 + 3 + 4 + 5 + 6 + 7)2 = 784.
784 is the sum of the first seven cubes: 13 + 23 + 33 + 43 + 53 + 63+ 73 = 784.
784 is 1002001 in base 3 and 3344 in base 6.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgS9IgWaeLhzdYn1biyl1VsCrTt2lS-Ivry4m4jL9sHHfrAM1DU-qmlWdK5vQc69slNbrU-hLrcLYUpZJAEz3IJP-xwT64qY3Fc8FJ7sWsYO66hnj7OyFAlyXh14p8kCEgdLS2XO2ed-iA/s400/n0784.jpg)
Source: Numeropedia