678868 has 24 divisors (see below), whose sum is σ = 1274112. Its totient is φ = 315744.

The previous prime is 678859. The next prime is 678871. The reversal of 678868 is 868876.

It is a happy number.

It is a super-2 number, since 2×678868² = 921723522848, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4246 + ... + 4402.

It is an arithmetic number, because the mean of its divisors is an integer number (53088).

2⁶⁷⁸⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

678868 is a deficient number, since it is larger than the sum of its proper divisors (595244).

678868 is a wasteful number, since it uses less digits than its factorization.

678868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231 (or 229 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 678868 is about 823.9344634132. The cubic root of 678868 is about 87.8877701529.

The spelling of 678868 in words is "six hundred seventy-eight thousand, eight hundred sixty-eight".