28204884 has 72 divisors (see below), whose sum is σ = 74162088. Its totient is φ = 9031680.

The previous prime is 28204871. The next prime is 28204889. The reversal of 28204884 is 48840282.

It can be written as a sum of positive squares in 4 ways, for example, as 4410000 + 23794884 = 2100^2 + 4878^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28204889) 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, 143074 + ... + 143270.

It is an arithmetic number, because the mean of its divisors is an integer number (1030029).

Almost surely, 2^28204884 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 28204884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37081044).

28204884 is an abundant number, since it is smaller than the sum of its proper divisors (45957204).

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

28204884 is a wasteful number, since it uses less digits than its factorization.

28204884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 36.

The square root of 28204884 is about 5310.8270542355. The cubic root of 28204884 is about 304.3977509427.

The spelling of 28204884 in words is "twenty-eight million, two hundred four thousand, eight hundred eighty-four".