678345 has 16 divisors (see below), whose sum is σ = 1112832. Its totient is φ = 352640.

The previous prime is 678343. The next prime is 678367. The reversal of 678345 is 543876.

678345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678345 - 2¹ = 678343 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (678341) 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, 64 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (69552).

2⁶⁷⁸³⁴⁵ is an apocalyptic number.

It is an amenable number.

678345 is a deficient number, since it is larger than the sum of its proper divisors (434487).

678345 is a wasteful number, since it uses less digits than its factorization.

678345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152.

The product of its digits is 20160, while the sum is 33.

The square root of 678345 is about 823.6170226507. The cubic root of 678345 is about 87.8651947711.

Adding to 678345 its reverse (543876), we get a palindrome (1222221).

The spelling of 678345 in words is "six hundred seventy-eight thousand, three hundred forty-five".