28557828 has 72 divisors (see below), whose sum is σ = 78478400. Its totient is φ = 8703936.

The previous prime is 28557827. The next prime is 28557857. The reversal of 28557828 is 82875582.

It is not an unprimeable number, because it can be changed into a prime (28557827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64833 + ... + 65271.

Almost surely, 2^28557828 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 28557828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39239200).

28557828 is an abundant number, since it is smaller than the sum of its proper divisors (49920572).

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

28557828 is a wasteful number, since it uses less digits than its factorization.

28557828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601 (or 596 counting only the distinct ones).

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

The square root of 28557828 is about 5343.9524698485. The cubic root of 28557828 is about 305.6621928967.

The spelling of 28557828 in words is "twenty-eight million, five hundred fifty-seven thousand, eight hundred twenty-eight".