678256 has 10 divisors (see below), whose sum is σ = 1314152. Its totient is φ = 339120.

The previous prime is 678253. The next prime is 678289. The reversal of 678256 is 652876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21180 + ... + 21211.

2⁶⁷⁸²⁵⁶ is an apocalyptic number.

It is an amenable number.

678256 is a deficient number, since it is larger than the sum of its proper divisors (635896).

678256 is a wasteful number, since it uses less digits than its factorization.

678256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42399 (or 42393 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 678256 is about 823.5629909120. The cubic root of 678256 is about 87.8613519162.

The spelling of 678256 in words is "six hundred seventy-eight thousand, two hundred fifty-six".