782

782 = 2 x 17 x 23.

782 is a pentagonal number (A000326).

782 is a number whose sum of divisors is a fourth power (A006532): 1 + 2 + 17 + 23 + 34 + 46 + 391 + 782 = 1296 = 6⁴.

The sum of the squares of the first 782 primes is a prime (A098561).

782 is a divisor of 47⁴ - 1.

Source: Number Gossip