678678 has 64 divisors (see below), whose sum is σ = 1838592. Its totient is φ = 161280.

The previous prime is 678659. The next prime is 678719. The reversal of 678678 is 876876.

678678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5950 + ... + 6062.

It is an arithmetic number, because the mean of its divisors is an integer number (28728).

2⁶⁷⁸⁶⁷⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919296).

678678 is an abundant number, since it is smaller than the sum of its proper divisors (1159914).

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

678678 is a wasteful number, since it uses less digits than its factorization.

678678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149.

The product of its digits is 112896, while the sum is 42.

The square root of 678678 is about 823.8191549120. The cubic root of 678678 is about 87.8795701128.

The spelling of 678678 in words is "six hundred seventy-eight thousand, six hundred seventy-eight".