66678 has 8 divisors (see below), whose sum is σ = 133368. Its totient is φ = 22224.

The previous prime is 66653. The next prime is 66683. The reversal of 66678 is 87666.

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

66678 is an admirable number.

It is a plaindrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5551 + ... + 5562.

It is an arithmetic number, because the mean of its divisors is an integer number (16671).

2⁶⁶⁶⁷⁸ is an apocalyptic number.

66678 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 (66684).

66678 is a wasteful number, since it uses less digits than its factorization.

66678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11118.

The product of its digits is 12096, while the sum is 33.

The square root of 66678 is about 258.2208357201. The cubic root of 66678 is about 40.5503108944.

The spelling of 66678 in words is "sixty-six thousand, six hundred seventy-eight".