6664664 has 32 divisors (see below), whose sum is σ = 13500000. Its totient is φ = 3075072.

The previous prime is 6664661. The next prime is 6664667. The reversal of 6664664 is 4664666.

It is an interprime number because it is at equal distance from previous prime (6664661) and next prime (6664667).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6664661) 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, 4712 + ... + 5960.

It is an arithmetic number, because the mean of its divisors is an integer number (421875).

Almost surely, 2^6664664 is an apocalyptic number.

It is an amenable number.

6664664 is an abundant number, since it is smaller than the sum of its proper divisors (6835336).

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

6664664 is a wasteful number, since it uses less digits than its factorization.

6664664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1307 (or 1303 counting only the distinct ones).

The product of its digits is 124416, while the sum is 38.

The square root of 6664664 is about 2581.6010536099. The cubic root of 6664664 is about 188.1883580739.

The spelling of 6664664 in words is "six million, six hundred sixty-four thousand, six hundred sixty-four".