6640055 has 8 divisors (see below), whose sum is σ = 7989072. Its totient is φ = 5298048.

The previous prime is 6640027. The next prime is 6640061. The reversal of 6640055 is 5500466.

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 6640055 - 2⁸ = 6639799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632 + ... + 3698.

It is an arithmetic number, because the mean of its divisors is an integer number (998634).

Almost surely, 2^6640055 is an apocalyptic number.

6640055 is a deficient number, since it is larger than the sum of its proper divisors (1349017).

6640055 is a wasteful number, since it uses less digits than its factorization.

6640055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3505.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 6640055 is about 2576.8304173927. The cubic root of 6640055 is about 187.9564464522.

The spelling of 6640055 in words is "six million, six hundred forty thousand, fifty-five".