6816978 has 72 divisors (see below), whose sum is σ = 17606160. Its totient is φ = 1900080.

The previous prime is 6816973. The next prime is 6817007. The reversal of 6816978 is 8796186.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6816973) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51973 + ... + 52103.

It is an arithmetic number, because the mean of its divisors is an integer number (244530).

Almost surely, 2^6816978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6816978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8803080).

6816978 is an abundant number, since it is smaller than the sum of its proper divisors (10789182).

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

6816978 is a wasteful number, since it uses less digits than its factorization.

6816978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 202 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 6816978 is about 2610.9343155277. The cubic root of 6816978 is about 189.6111901209.

The spelling of 6816978 in words is "six million, eight hundred sixteen thousand, nine hundred seventy-eight".