6664608 has 72 divisors (see below), whose sum is σ = 19272708. Its totient is φ = 2184192.

The previous prime is 6664607. The next prime is 6664631. The reversal of 6664608 is 8064666.

It can be written as a sum of positive squares in 2 ways, for example, as 6290064 + 374544 = 2508^2 + 612^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6664607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20866 + ... + 21182.

Almost surely, 2^6664608 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 6664608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9636354).

6664608 is an abundant number, since it is smaller than the sum of its proper divisors (12608100).

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

6664608 is a wasteful number, since it uses less digits than its factorization.

6664608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 6664608 is about 2581.5902076046. The cubic root of 6664608 is about 188.1878309867.

The spelling of 6664608 in words is "six million, six hundred sixty-four thousand, six hundred eight".