6640056 has 40 divisors (see below), whose sum is σ = 18600120. Its totient is φ = 2213136.

The previous prime is 6640027. The next prime is 6640061. The reversal of 6640056 is 6500466.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 4476 + ... + 5771.

It is an arithmetic number, because the mean of its divisors is an integer number (465003).

Almost surely, 2^6640056 is an apocalyptic number.

It is an amenable number.

6640056 is an abundant number, since it is smaller than the sum of its proper divisors (11960064).

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

6640056 is a wasteful number, since it uses less digits than its factorization.

6640056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10265 (or 10252 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 6640056 is about 2576.8306114295. The cubic root of 6640056 is about 187.9564558877.

The spelling of 6640056 in words is "six million, six hundred forty thousand, fifty-six".