6556732728 has 384 divisors, whose sum is σ = 22200998400. Its totient is φ = 1594543104.

The previous prime is 6556732711. The next prime is 6556732733. The reversal of 6556732728 is 8272376556.

It is a happy number.

Its product of digits (4233600) is a multiple of the sum of its prime divisors (720).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10196775 + ... + 10197417.

It is an arithmetic number, because the mean of its divisors is an integer number (57815100).

Almost surely, 2^6556732728 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 6556732728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11100499200).

6556732728 is an abundant number, since it is smaller than the sum of its proper divisors (15644265672).

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

6556732728 is a wasteful number, since it uses less digits than its factorization.

6556732728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731 (or 720 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 51.

The square root of 6556732728 is about 80973.6545303471. The cubic root of 6556732728 is about 1871.6694869960.

The spelling of 6556732728 in words is "six billion, five hundred fifty-six million, seven hundred thirty-two thousand, seven hundred twenty-eight".