4247128728 has 96 divisors (see below), whose sum is σ = 11944820160. Its totient is φ = 1413793440.

The previous prime is 4247128673. The next prime is 4247128741. The reversal of 4247128728 is 8278217424.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2773323 + ... + 2774853.

It is an arithmetic number, because the mean of its divisors is an integer number (124425210).

Almost surely, 2^4247128728 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 4247128728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5972410080).

4247128728 is an abundant number, since it is smaller than the sum of its proper divisors (7697691432).

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

4247128728 is a wasteful number, since it uses less digits than its factorization.

4247128728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2979 (or 2963 counting only the distinct ones).

The product of its digits is 401408, while the sum is 45.

The square root of 4247128728 is about 65169.9986803744. The cubic root of 4247128728 is about 1619.4410417294.

The spelling of 4247128728 in words is "four billion, two hundred forty-seven million, one hundred twenty-eight thousand, seven hundred twenty-eight".