6664878 has 48 divisors (see below), whose sum is σ = 16157232. Its totient is φ = 1968000.

The previous prime is 6664873. The next prime is 6664891. The reversal of 6664878 is 8784666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7708 + ... + 8528.

It is an arithmetic number, because the mean of its divisors is an integer number (336609).

Almost surely, 2^6664878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8078616).

6664878 is an abundant number, since it is smaller than the sum of its proper divisors (9492354).

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

6664878 is a wasteful number, since it uses less digits than its factorization.

6664878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881 (or 878 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 6664878 is about 2581.6425004249. The cubic root of 6664878 is about 188.1903722729.

The spelling of 6664878 in words is "six million, six hundred sixty-four thousand, eight hundred seventy-eight".