5128728 has 32 divisors (see below), whose sum is σ = 13988160. Its totient is φ = 1554080.

The previous prime is 5128723. The next prime is 5128751. The reversal of 5128728 is 8278215.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5128723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9450 + ... + 9977.

It is an arithmetic number, because the mean of its divisors is an integer number (437130).

Almost surely, 2^5128728 is an apocalyptic number.

It is an amenable number.

5128728 is an abundant number, since it is smaller than the sum of its proper divisors (8859432).

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

5128728 is a wasteful number, since it uses less digits than its factorization.

5128728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19447 (or 19443 counting only the distinct ones).

The product of its digits is 8960, while the sum is 33.

The square root of 5128728 is about 2264.6695123130. The cubic root of 5128728 is about 172.4526566148.

It can be divided in two parts, 51287 and 28, that added together give a palindrome (51315).

The spelling of 5128728 in words is "five million, one hundred twenty-eight thousand, seven hundred twenty-eight".