6543728 has 40 divisors (see below), whose sum is σ = 13332480. Its totient is φ = 3107520.

The previous prime is 6543701. The next prime is 6543731. The reversal of 6543728 is 8273456.

It is a happy number.

It is a super-2 number, since 2×6543728² = 85640752275968, which contains 22 as substring.

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, 39101 + ... + 39267.

It is an arithmetic number, because the mean of its divisors is an integer number (333312).

Almost surely, 2^6543728 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 6543728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6666240).

6543728 is an abundant number, since it is smaller than the sum of its proper divisors (6788752).

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

6543728 is a wasteful number, since it uses less digits than its factorization.

6543728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 279 counting only the distinct ones).

The product of its digits is 40320, while the sum is 35.

The square root of 6543728 is about 2558.0711483460. The cubic root of 6543728 is about 187.0431234967.

The spelling of 6543728 in words is "six million, five hundred forty-three thousand, seven hundred twenty-eight".