6728440 has 16 divisors (see below), whose sum is σ = 15139080. Its totient is φ = 2691360.

The previous prime is 6728437. The next prime is 6728441. The reversal of 6728440 is 448276.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728441) 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 3 ways as a sum of consecutive naturals, for example, 84066 + ... + 84145.

Almost surely, 2^6728440 is an apocalyptic number.

It is an amenable number.

6728440 is an abundant number, since it is smaller than the sum of its proper divisors (8410640).

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

6728440 is a wasteful number, since it uses less digits than its factorization.

6728440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168222 (or 168218 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 6728440 is about 2593.9236688846. The cubic root of 6728440 is about 188.7867288144.

The spelling of 6728440 in words is "six million, seven hundred twenty-eight thousand, four hundred forty".