6620544 has 96 divisors (see below), whose sum is σ = 21799440. Its totient is φ = 1889280.

The previous prime is 6620519. The next prime is 6620587. The reversal of 6620544 is 4450266.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7654 + ... + 8474.

Almost surely, 2^6620544 is an apocalyptic number.

6620544 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 6620544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10899720).

6620544 is an abundant number, since it is smaller than the sum of its proper divisors (15178896).

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

6620544 is a wasteful number, since it uses less digits than its factorization.

6620544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 6620544 is about 2573.0417796841. The cubic root of 6620544 is about 187.7721700673.

The spelling of 6620544 in words is "six million, six hundred twenty thousand, five hundred forty-four".