6544720 has 160 divisors (see below), whose sum is σ = 19998720. Its totient is φ = 1935360.

The previous prime is 6544667. The next prime is 6544739. The reversal of 6544720 is 274456.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211105 + ... + 211135.

It is an arithmetic number, because the mean of its divisors is an integer number (124992).

Almost surely, 2^6544720 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 6544720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9999360).

6544720 is an abundant number, since it is smaller than the sum of its proper divisors (13454000).

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

6544720 is a wasteful number, since it uses less digits than its factorization.

6544720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 6544720 is about 2558.2650370906. The cubic root of 6544720 is about 187.0525746537.

The spelling of 6544720 in words is "six million, five hundred forty-four thousand, seven hundred twenty".