678378 has 8 divisors (see below), whose sum is σ = 1356768. Its totient is φ = 226124.

The previous prime is 678371. The next prime is 678383. The reversal of 678378 is 873876.

It is a sphenic number, since it is the product of 3 distinct primes.

678378 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678371) by changing a digit.

678378 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 in 3 ways as a sum of consecutive naturals, for example, 56526 + ... + 56537.

It is an arithmetic number, because the mean of its divisors is an integer number (169596).

2⁶⁷⁸³⁷⁸ is an apocalyptic number.

678378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

678378 is a wasteful number, since it uses less digits than its factorization.

678378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113068.

The product of its digits is 56448, while the sum is 39.

The square root of 678378 is about 823.6370559901. The cubic root of 678378 is about 87.8666195645.

The spelling of 678378 in words is "six hundred seventy-eight thousand, three hundred seventy-eight".