28821804 has 48 divisors (see below), whose sum is σ = 74153856. Its totient is φ = 8640000.

The previous prime is 28821797. The next prime is 28821827. The reversal of 28821804 is 40812882.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11679 + ... + 13929.

It is an arithmetic number, because the mean of its divisors is an integer number (1544872).

Almost surely, 2^28821804 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 28821804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37076928).

28821804 is an abundant number, since it is smaller than the sum of its proper divisors (45332052).

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

28821804 is a wasteful number, since it uses less digits than its factorization.

28821804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2366 (or 2364 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 28821804 is about 5368.5942294049. The cubic root of 28821804 is about 306.6011081242.

The spelling of 28821804 in words is "twenty-eight million, eight hundred twenty-one thousand, eight hundred four".