778256 has 20 divisors (see below), whose sum is σ = 1523712. Its totient is φ = 385056.

The previous prime is 778247. The next prime is 778301. The reversal of 778256 is 652877.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 778256.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841 + ... + 2223.

2⁷⁷⁸²⁵⁶ is an apocalyptic number.

It is an amenable number.

778256 is a deficient number, since it is larger than the sum of its proper divisors (745456).

778256 is a wasteful number, since it uses less digits than its factorization.

778256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518 (or 512 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 778256 is about 882.1881885403. The cubic root of 778256 is about 91.9829836203.

The spelling of 778256 in words is "seven hundred seventy-eight thousand, two hundred fifty-six".