6647725 has 12 divisors (see below), whose sum is σ = 9421024. Its totient is φ = 4558320.

The previous prime is 6647717. The next prime is 6647741. The reversal of 6647725 is 5277466.

It is not a de Polignac number, because 6647725 - 2³ = 6647717 is a prime.

It is a super-3 number, since 3×6647725³ (a number of 21 digits) contains 333 as substring.

It is a d-powerful number, because it can be written as 6³ + 6⁷ + 4² + 7³ + 7⁸ + 2¹⁹ + 5⁷ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18819 + ... + 19168.

Almost surely, 2^6647725 is an apocalyptic number.

It is an amenable number.

6647725 is a deficient number, since it is larger than the sum of its proper divisors (2773299).

6647725 is a wasteful number, since it uses less digits than its factorization.

6647725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38004 (or 37999 counting only the distinct ones).

The product of its digits is 70560, while the sum is 37.

The square root of 6647725 is about 2578.3182503330. The cubic root of 6647725 is about 188.0287887858.

The spelling of 6647725 in words is "six million, six hundred forty-seven thousand, seven hundred twenty-five".