6664788 has 96 divisors (see below), whose sum is σ = 19192320. Its totient is φ = 1987200.

The previous prime is 6664787. The next prime is 6664789. The reversal of 6664788 is 8874666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6664787) and next prime (6664789).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65938 + ... + 66038.

It is an arithmetic number, because the mean of its divisors is an integer number (199920).

Almost surely, 2^6664788 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 6664788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9596160).

6664788 is an abundant number, since it is smaller than the sum of its proper divisors (12527532).

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

6664788 is a wasteful number, since it uses less digits than its factorization.

6664788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 166 counting only the distinct ones).

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

The square root of 6664788 is about 2581.6250696025. The cubic root of 6664788 is about 188.1895251851.

The spelling of 6664788 in words is "six million, six hundred sixty-four thousand, seven hundred eighty-eight".