28821072 has 80 divisors (see below), whose sum is σ = 87867392. Its totient is φ = 7966080.

The previous prime is 28821071. The next prime is 28821077. The reversal of 28821072 is 27012882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28821071) 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 15 ways as a sum of consecutive naturals, for example, 9033 + ... + 11799.

Almost surely, 2^28821072 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 28821072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43933696).

28821072 is an abundant number, since it is smaller than the sum of its proper divisors (59046320).

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

28821072 is a wasteful number, since it uses less digits than its factorization.

28821072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816 (or 2810 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 28821072 is about 5368.5260547007. The cubic root of 28821072 is about 306.5985124747.

The spelling of 28821072 in words is "twenty-eight million, eight hundred twenty-one thousand, seventy-two".