6729727728 has 80 divisors (see below), whose sum is σ = 17816109696. Its totient is φ = 2187790080.

The previous prime is 6729727717. The next prime is 6729727747. The reversal of 6729727728 is 8277279276.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1642963 + ... + 1647053.

Almost surely, 2^6729727728 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 6729727728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8908054848).

6729727728 is an abundant number, since it is smaller than the sum of its proper divisors (11086381968).

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

6729727728 is a wasteful number, since it uses less digits than its factorization.

6729727728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4942 (or 4936 counting only the distinct ones).

The product of its digits is 8297856, while the sum is 57.

The square root of 6729727728 is about 82034.9177362908. The cubic root of 6729727728 is about 1887.9877174701.

The spelling of 6729727728 in words is "six billion, seven hundred twenty-nine million, seven hundred twenty-seven thousand, seven hundred twenty-eight".