28875528 has 80 divisors (see below), whose sum is σ = 88252560. Its totient is φ = 8748000.

The previous prime is 28875523. The next prime is 28875533. The reversal of 28875528 is 82557882.

It is an interprime number because it is at equal distance from previous prime (28875523) and next prime (28875533).

It is a super-2 number, since 2×28875528² = 1667592234557568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28875523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5103 + ... + 9153.

It is an arithmetic number, because the mean of its divisors is an integer number (1103157).

Almost surely, 2^28875528 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 28875528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44126280).

28875528 is an abundant number, since it is smaller than the sum of its proper divisors (59377032).

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

28875528 is a wasteful number, since it uses less digits than its factorization.

28875528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080 (or 4067 counting only the distinct ones).

The product of its digits is 358400, while the sum is 45.

The square root of 28875528 is about 5373.5954443929. The cubic root of 28875528 is about 306.7914919275.

It can be divided in two parts, 28875 and 528, that added together give a triangular number (29403 = T₂₄₂).

The spelling of 28875528 in words is "twenty-eight million, eight hundred seventy-five thousand, five hundred twenty-eight".