678928 has 10 divisors (see below), whose sum is σ = 1315454. Its totient is φ = 339456.

The previous prime is 678907. The next prime is 678941. The reversal of 678928 is 829876.

678928 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 595984 + 82944 = 772^2 + 288^2 .

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 as a sum of consecutive naturals, namely, 21201 + ... + 21232.

2⁶⁷⁸⁹²⁸ is an apocalyptic number.

It is an amenable number.

678928 is a deficient number, since it is larger than the sum of its proper divisors (636526).

678928 is a wasteful number, since it uses less digits than its factorization.

678928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42441 (or 42435 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 678928 is about 823.9708732716. The cubic root of 678928 is about 87.8903593213.

The spelling of 678928 in words is "six hundred seventy-eight thousand, nine hundred twenty-eight".