5128489728 has 216 divisors, whose sum is σ = 16145147200. Its totient is φ = 1619149824.

The previous prime is 5128489687. The next prime is 5128489733. The reversal of 5128489728 is 8279848215.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1179783 + ... + 1184121.

Almost surely, 2^5128489728 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 5128489728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8072573600).

5128489728 is an abundant number, since it is smaller than the sum of its proper divisors (11016657472).

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

5128489728 is an equidigital number, since it uses as much as digits as its factorization.

5128489728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4389 (or 4363 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The square root of 5128489728 is about 71613.4744863004. The cubic root of 5128489728 is about 1724.4998595419.

The spelling of 5128489728 in words is "five billion, one hundred twenty-eight million, four hundred eighty-nine thousand, seven hundred twenty-eight".