678366 has 36 divisors (see below), whose sum is σ = 1598688. Its totient is φ = 207792.

The previous prime is 678343. The next prime is 678367. The reversal of 678366 is 663876.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 678366.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 678366.

It is not an unprimeable number, because it can be changed into a prime (678367) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2931 + ... + 3153.

It is an arithmetic number, because the mean of its divisors is an integer number (44408).

2⁶⁷⁸³⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (799344).

678366 is an abundant number, since it is smaller than the sum of its proper divisors (920322).

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

678366 is a wasteful number, since it uses less digits than its factorization.

678366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 241 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 678366 is about 823.6297711958. The cubic root of 678366 is about 87.8661014632.

The spelling of 678366 in words is "six hundred seventy-eight thousand, three hundred sixty-six".