678836 has 6 divisors (see below), whose sum is σ = 1187970. Its totient is φ = 339416.

The previous prime is 678833. The next prime is 678859. The reversal of 678836 is 638876.

It can be written as a sum of positive squares in only one way, i.e., 630436 + 48400 = 794^2 + 220^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678833) by changing a digit.

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 as a sum of consecutive naturals, namely, 84851 + ... + 84858.

It is an arithmetic number, because the mean of its divisors is an integer number (197995).

2⁶⁷⁸⁸³⁶ is an apocalyptic number.

It is an amenable number.

678836 is a deficient number, since it is larger than the sum of its proper divisors (509134).

678836 is a wasteful number, since it uses less digits than its factorization.

678836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169713 (or 169711 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 678836 is about 823.9150441641. The cubic root of 678836 is about 87.8863892006.

The spelling of 678836 in words is "six hundred seventy-eight thousand, eight hundred thirty-six".