63978 has 8 divisors (see below), whose sum is σ = 127968. Its totient is φ = 21324.

The previous prime is 63977. The next prime is 63997. The reversal of 63978 is 87936.

It is a happy number.

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

63978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (63977) by changing a digit.

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, 5326 + ... + 5337.

It is an arithmetic number, because the mean of its divisors is an integer number (15996).

2⁶³⁹⁷⁸ is an apocalyptic number.

63978 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.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63984).

63978 is a wasteful number, since it uses less digits than its factorization.

63978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668.

The product of its digits is 9072, while the sum is 33.

The square root of 63978 is about 252.9387277583. The cubic root of 63978 is about 39.9954161414.

It can be divided in two parts, 639 and 78, that added together give a palindrome (717).

The spelling of 63978 in words is "sixty-three thousand, nine hundred seventy-eight".