6643347 has 8 divisors (see below), whose sum is σ = 8970240. Its totient is φ = 4372680.

The previous prime is 6643337. The next prime is 6643361. The reversal of 6643347 is 7433466.

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

It is not a de Polignac number, because 6643347 - 2⁶ = 6643283 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 6⁶ + 6⁸ + 4³ + 3² + 3¹⁴ + 4⁷ + 7⁶ .

It is not an unprimeable number, because it can be changed into a prime (6643337) by changing a digit.

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, 13779 + ... + 14252.

It is an arithmetic number, because the mean of its divisors is an integer number (1121280).

Almost surely, 2^6643347 is an apocalyptic number.

6643347 is a deficient number, since it is larger than the sum of its proper divisors (2326893).

6643347 is a wasteful number, since it uses less digits than its factorization.

6643347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28113.

The product of its digits is 36288, while the sum is 33.

The square root of 6643347 is about 2577.4691074773. The cubic root of 6643347 is about 187.9875029417.

The spelling of 6643347 in words is "six million, six hundred forty-three thousand, three hundred forty-seven".