6645228 has 12 divisors (see below), whose sum is σ = 15505560. Its totient is φ = 2215072.

The previous prime is 6645227. The next prime is 6645259. The reversal of 6645228 is 8225466.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (6645227) 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 3 ways as a sum of consecutive naturals, for example, 276873 + ... + 276896.

It is an arithmetic number, because the mean of its divisors is an integer number (1292130).

Almost surely, 2^6645228 is an apocalyptic number.

It is an amenable number.

6645228 is an abundant number, since it is smaller than the sum of its proper divisors (8860332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6645228 is a wasteful number, since it uses less digits than its factorization.

6645228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553776 (or 553774 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 6645228 is about 2577.8339744832. The cubic root of 6645228 is about 188.0052435538.

The spelling of 6645228 in words is "six million, six hundred forty-five thousand, two hundred twenty-eight".