6645144 has 32 divisors (see below), whose sum is σ = 18123840. Its totient is φ = 2013600.

The previous prime is 6645139. The next prime is 6645151. The reversal of 6645144 is 4415466.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12322 + ... + 12849.

It is an arithmetic number, because the mean of its divisors is an integer number (566370).

Almost surely, 2^6645144 is an apocalyptic number.

It is an amenable number.

6645144 is an abundant number, since it is smaller than the sum of its proper divisors (11478696).

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

6645144 is a wasteful number, since it uses less digits than its factorization.

6645144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25191 (or 25187 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 6645144 is about 2577.8176816835. The cubic root of 6645144 is about 188.0044513809.

The spelling of 6645144 in words is "six million, six hundred forty-five thousand, one hundred forty-four".