6647045 has 6 divisors (see below), whose sum is σ = 7983378. Its totient is φ = 5313024.

The previous prime is 6647041. The next prime is 6647059. The reversal of 6647045 is 5407466.

It can be written as a sum of positive squares in 3 ways, for example, as 2316484 + 4330561 = 1522^2 + 2081^2 .

It is not a de Polignac number, because 6647045 - 2² = 6647041 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 (6647041) 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 5 ways as a sum of consecutive naturals, for example, 5189 + ... + 6341.

It is an arithmetic number, because the mean of its divisors is an integer number (1330563).

Almost surely, 2^6647045 is an apocalyptic number.

It is an amenable number.

6647045 is a deficient number, since it is larger than the sum of its proper divisors (1336333).

6647045 is an frugal number, since it uses more digits than its factorization.

6647045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 6647045 is about 2578.1863780573. The cubic root of 6647045 is about 188.0223773726.

The spelling of 6647045 in words is "six million, six hundred forty-seven thousand, forty-five".