6443647 has 12 divisors (see below), whose sum is σ = 7571880. Its totient is φ = 5467056.

The previous prime is 6443639. The next prime is 6443677. The reversal of 6443647 is 7463446.

It is not a de Polignac number, because 6443647 - 2³ = 6443639 is a prime.

It is a Duffinian number.

6443647 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6443677) 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 11 ways as a sum of consecutive naturals, for example, 4629 + ... + 5857.

It is an arithmetic number, because the mean of its divisors is an integer number (630990).

Almost surely, 2^6443647 is an apocalyptic number.

6443647 is a deficient number, since it is larger than the sum of its proper divisors (1128233).

6443647 is a wasteful number, since it uses less digits than its factorization.

6443647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350 (or 1343 counting only the distinct ones).

The product of its digits is 48384, while the sum is 34.

The square root of 6443647 is about 2538.4339660507. The cubic root of 6443647 is about 186.0846629644.

The spelling of 6443647 in words is "six million, four hundred forty-three thousand, six hundred forty-seven".