663378 has 8 divisors (see below), whose sum is σ = 1326768. Its totient is φ = 221124.

The previous prime is 663371. The next prime is 663407. The reversal of 663378 is 873366.

It is a happy number.

663378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

663378 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (663371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55276 + ... + 55287.

It is an arithmetic number, because the mean of its divisors is an integer number (165846).

2⁶⁶³³⁷⁸ is an apocalyptic number.

663378 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.

663378 is a wasteful number, since it uses less digits than its factorization.

663378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110568.

The product of its digits is 18144, while the sum is 33.

The square root of 663378 is about 814.4802023377. The cubic root of 663378 is about 87.2141638749.

The spelling of 663378 in words is "six hundred sixty-three thousand, three hundred seventy-eight".