6664128 has 56 divisors (see below), whose sum is σ = 17952720. Its totient is φ = 2181120.

The previous prime is 6664121. The next prime is 6664139. The reversal of 6664128 is 8214666.

It is a happy number.

6664128 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11428 + ... + 11996.

Almost surely, 2^6664128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6664128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8976360).

6664128 is an abundant number, since it is smaller than the sum of its proper divisors (11288592).

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

6664128 is a wasteful number, since it uses less digits than its factorization.

6664128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 635 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 6664128 is about 2581.4972399753. The cubic root of 6664128 is about 188.1833129752.

The spelling of 6664128 in words is "six million, six hundred sixty-four thousand, one hundred twenty-eight".