28821024 has 144 divisors (see below), whose sum is σ = 90417600. Its totient is φ = 8667648.

The previous prime is 28820993. The next prime is 28821049. The reversal of 28821024 is 42012882.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125742 + ... + 125970.

It is an arithmetic number, because the mean of its divisors is an integer number (627900).

Almost surely, 2^28821024 is an apocalyptic number.

28821024 is a gapful number since it is divisible by the number (24) 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 28821024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45208800).

28821024 is an abundant number, since it is smaller than the sum of its proper divisors (61596576).

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

28821024 is a wasteful number, since it uses less digits than its factorization.

28821024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 28821024 is about 5368.5215841980. The cubic root of 28821024 is about 306.5983422666.

It can be divided in two parts, 288 and 21024, that added together give a palindrome (21312).

The spelling of 28821024 in words is "twenty-eight million, eight hundred twenty-one thousand, twenty-four".