678612 has 48 divisors (see below), whose sum is σ = 1778112. Its totient is φ = 199680.

The previous prime is 678611. The next prime is 678631. The reversal of 678612 is 216876.

It is a happy number.

678612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (4032) is a multiple of the sum of its prime factors (168).

It is a self number, because there is not a number n which added to its sum of digits gives 678612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6948 + ... + 7044.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

2⁶⁷⁸⁶¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (889056).

678612 is an abundant number, since it is smaller than the sum of its proper divisors (1099500).

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

678612 is a wasteful number, since it uses less digits than its factorization.

678612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 166 counting only the distinct ones).

The product of its digits is 4032, while the sum is 30.

The square root of 678612 is about 823.7790966030. The cubic root of 678612 is about 87.8767213197.

The spelling of 678612 in words is "six hundred seventy-eight thousand, six hundred twelve".