6640047 has 12 divisors (see below), whose sum is σ = 10155600. Its totient is φ = 4166208.

The previous prime is 6640027. The next prime is 6640061. The reversal of 6640047 is 7400466.

It is not a de Polignac number, because 6640047 - 2²⁰ = 5591471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6640047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640027) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 21547 + ... + 21852.

It is an arithmetic number, because the mean of its divisors is an integer number (846300).

Almost surely, 2^6640047 is an apocalyptic number.

6640047 is a deficient number, since it is larger than the sum of its proper divisors (3515553).

6640047 is a wasteful number, since it uses less digits than its factorization.

6640047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43422 (or 43419 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 6640047 is about 2576.8288650976. The cubic root of 6640047 is about 187.9563709683.

The spelling of 6640047 in words is "six million, six hundred forty thousand, forty-seven".