6640007 has 8 divisors (see below), whose sum is σ = 7343760. Its totient is φ = 5952960.

The previous prime is 6640003. The next prime is 6640009. The reversal of 6640007 is 7000466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6640007 - 2² = 6640003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640003) 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 7 ways as a sum of consecutive naturals, for example, 3332 + ... + 4937.

It is an arithmetic number, because the mean of its divisors is an integer number (917970).

Almost surely, 2^6640007 is an apocalyptic number.

6640007 is a deficient number, since it is larger than the sum of its proper divisors (703753).

6640007 is a wasteful number, since it uses less digits than its factorization.

6640007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8353.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 6640007 is about 2576.8211036081. The cubic root of 6640007 is about 187.9559935478.

It can be divided in two parts, 66 and 40007, that multiplied together give a palindrome (2640462).

The spelling of 6640007 in words is "six million, six hundred forty thousand, seven".