28511728 has 60 divisors (see below), whose sum is σ = 65902032. Its totient is φ = 11907840.

The previous prime is 28511713. The next prime is 28511729. The reversal of 28511728 is 82711582.

It is a junction number, because it is equal to n+sod(n) for n = 28511693 and 28511702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28511729) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 31701 + ... + 32587.

Almost surely, 2^28511728 is an apocalyptic number.

28511728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28511728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32951016).

28511728 is an abundant number, since it is smaller than the sum of its proper divisors (37390304).

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

28511728 is a wasteful number, since it uses less digits than its factorization.

28511728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950 (or 937 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 28511728 is about 5339.6374408756. The cubic root of 28511728 is about 305.4976307069.

The spelling of 28511728 in words is "twenty-eight million, five hundred eleven thousand, seven hundred twenty-eight".