6647385 has 8 divisors (see below), whose sum is σ = 10635840. Its totient is φ = 3545264.

The previous prime is 6647369. The next prime is 6647393. The reversal of 6647385 is 5837466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6647385 - 2⁴ = 6647369 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 221565 + ... + 221594.

It is an arithmetic number, because the mean of its divisors is an integer number (1329480).

Almost surely, 2^6647385 is an apocalyptic number.

It is an amenable number.

6647385 is a deficient number, since it is larger than the sum of its proper divisors (3988455).

6647385 is a wasteful number, since it uses less digits than its factorization.

6647385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443167.

The product of its digits is 120960, while the sum is 39.

The square root of 6647385 is about 2578.2523150382. The cubic root of 6647385 is about 188.0255831338.

The spelling of 6647385 in words is "six million, six hundred forty-seven thousand, three hundred eighty-five".