6978 has 8 divisors (see below), whose sum is σ = 13968. Its totient is φ = 2324.

The previous prime is 6977. The next prime is 6983. The reversal of 6978 is 8796.

It is a happy number.

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

6978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (6971) 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, 576 + ... + 587.

It is an arithmetic number, because the mean of its divisors is an integer number (1746).

2⁶⁹⁷⁸ is an apocalyptic number.

6978 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 (6984).

6978 is a wasteful number, since it uses less digits than its factorization.

6978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168.

The product of its digits is 3024, while the sum is 30.

The square root of 6978 is about 83.5344240418. The cubic root of 6978 is about 19.1092505650.

The spelling of 6978 in words is "six thousand, nine hundred seventy-eight".