70

70 is the natural number preceding 71 and succeeding 69.

Properties

 * 70 ' s prime factorization is 2*5*7.
 * The digital root of 70 is 7.
 * The square of 70 is 4,900.
 * 70 is the smallest weird number.
 * 70 is the only nontrivial m such that 1^2 + 2^2 + 3^2 + ... n^2 = m^2 has a solution