6640775 has 12 divisors (see below), whose sum is σ = 8266584. Its totient is φ = 5292000.

The previous prime is 6640769. The next prime is 6640793. The reversal of 6640775 is 5770466.

It is not a de Polignac number, because 6640775 - 2⁴ = 6640759 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 (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12005 + ... + 12545.

It is an arithmetic number, because the mean of its divisors is an integer number (688882).

Almost surely, 2^6640775 is an apocalyptic number.

6640775 is a deficient number, since it is larger than the sum of its proper divisors (1625809).

6640775 is a wasteful number, since it uses less digits than its factorization.

6640775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 6640775 is about 2576.9701201217. The cubic root of 6640775 is about 187.9632397569.

The spelling of 6640775 in words is "six million, six hundred forty thousand, seven hundred seventy-five".