6428644 has 12 divisors (see below), whose sum is σ = 11302144. Its totient is φ = 3199464.

The previous prime is 6428627. The next prime is 6428647. The reversal of 6428644 is 4468246.

It is a happy number.

6428644 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (6428647) 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 3 ways as a sum of consecutive naturals, for example, 2712 + ... + 4495.

Almost surely, 2^6428644 is an apocalyptic number.

It is an amenable number.

6428644 is a deficient number, since it is larger than the sum of its proper divisors (4873500).

6428644 is a wasteful number, since it uses less digits than its factorization.

6428644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7434 (or 7432 counting only the distinct ones).

The product of its digits is 36864, while the sum is 34.

The square root of 6428644 is about 2535.4770754239. The cubic root of 6428644 is about 185.9401279529.

The spelling of 6428644 in words is "six million, four hundred twenty-eight thousand, six hundred forty-four".