6645504 has 72 divisors (see below), whose sum is σ = 18763920. Its totient is φ = 2080768.

The previous prime is 6645493. The next prime is 6645517. The reversal of 6645504 is 4055466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12802 + ... + 13310.

It is an arithmetic number, because the mean of its divisors is an integer number (260610).

Almost surely, 2^6645504 is an apocalyptic number.

6645504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6645504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9381960).

6645504 is an abundant number, since it is smaller than the sum of its proper divisors (12118416).

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

6645504 is a wasteful number, since it uses less digits than its factorization.

6645504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 6645504 is about 2577.8875072431. The cubic root of 6645504 is about 188.0078463603.

It can be divided in two parts, 6 and 645504, that multiplied together give a square (3873024 = 1968²).

The spelling of 6645504 in words is "six million, six hundred forty-five thousand, five hundred four".