6601644 has 144 divisors (see below), whose sum is σ = 21385728. Its totient is φ = 1672704.

The previous prime is 6601643. The next prime is 6601649. The reversal of 6601644 is 4461066.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6601643) 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 47 ways as a sum of consecutive naturals, for example, 98499 + ... + 98565.

It is an arithmetic number, because the mean of its divisors is an integer number (148512).

Almost surely, 2^6601644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6601644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10692864).

6601644 is an abundant number, since it is smaller than the sum of its proper divisors (14784084).

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

6601644 is a wasteful number, since it uses less digits than its factorization.

6601644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 6601644 is about 2569.3664588766. The cubic root of 6601644 is about 187.5933188808.

It can be divided in two parts, 660 and 1644, that added together give a square (2304 = 48²).

The spelling of 6601644 in words is "six million, six hundred one thousand, six hundred forty-four".