6645328 has 20 divisors (see below), whose sum is σ = 13069600. Its totient is φ = 3272544.

The previous prime is 6645319. The next prime is 6645329. The reversal of 6645328 is 8235466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6645293 and 6645302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2028 + ... + 4171.

It is an arithmetic number, because the mean of its divisors is an integer number (653480).

Almost surely, 2^6645328 is an apocalyptic number.

It is an amenable number.

6645328 is a deficient number, since it is larger than the sum of its proper divisors (6424272).

6645328 is a wasteful number, since it uses less digits than its factorization.

6645328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274 (or 6268 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 6645328 is about 2577.8533705391. The cubic root of 6645328 is about 188.0061866079.

The spelling of 6645328 in words is "six million, six hundred forty-five thousand, three hundred twenty-eight".