678356 has 18 divisors (see below), whose sum is σ = 1381338. Its totient is φ = 290640.

The previous prime is 678343. The next prime is 678367. The reversal of 678356 is 653876.

It is a happy number.

678356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 188356 = 700^2 + 434^2 .

It is a congruent number.

It is an unprimeable number.

678356 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1535 + ... + 1926.

It is an arithmetic number, because the mean of its divisors is an integer number (76741).

2⁶⁷⁸³⁵⁶ is an apocalyptic number.

It is an amenable number.

678356 is an abundant number, since it is smaller than the sum of its proper divisors (702982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678356 is a wasteful number, since it uses less digits than its factorization.

678356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3479 (or 3470 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 678356 is about 823.6237004846. The cubic root of 678356 is about 87.8656697074.

The spelling of 678356 in words is "six hundred seventy-eight thousand, three hundred fifty-six".