6640008 has 48 divisors (see below), whose sum is σ = 17386320. Its totient is φ = 2113056.

The previous prime is 6640003. The next prime is 6640009. The reversal of 6640008 is 8000466.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 6640008.

It is not an unprimeable number, because it can be changed into a prime (6640003) 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, 12435 + ... + 12957.

It is an arithmetic number, because the mean of its divisors is an integer number (362215).

Almost surely, 2^6640008 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 6640008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8693160).

6640008 is an abundant number, since it is smaller than the sum of its proper divisors (10746312).

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

6640008 is a wasteful number, since it uses less digits than its factorization.

6640008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 6640008 is about 2576.8212976456. The cubic root of 6640008 is about 187.9560029833.

The spelling of 6640008 in words is "six million, six hundred forty thousand, eight".