6644045 has 8 divisors (see below), whose sum is σ = 8247960. Its totient is φ = 5131840.

The previous prime is 6644023. The next prime is 6644047. The reversal of 6644045 is 5404466.

It can be written as a sum of positive squares in 4 ways, for example, as 2778889 + 3865156 = 1667^2 + 1966^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6644045 - 2⁶ = 6643981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 6643999 and 6644017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6644047) 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 7 ways as a sum of consecutive naturals, for example, 22766 + ... + 23055.

It is an arithmetic number, because the mean of its divisors is an integer number (1030995).

Almost surely, 2^6644045 is an apocalyptic number.

It is an amenable number.

6644045 is a deficient number, since it is larger than the sum of its proper divisors (1603915).

6644045 is a wasteful number, since it uses less digits than its factorization.

6644045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45855.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 6644045 is about 2577.6045080656. The cubic root of 6644045 is about 187.9940865048.

The spelling of 6644045 in words is "six million, six hundred forty-four thousand, forty-five".