28504224 has 120 divisors (see below), whose sum is σ = 95866848. Its totient is φ = 8138880.

The previous prime is 28504219. The next prime is 28504243. The reversal of 28504224 is 42240582.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17359 + ... + 18929.

Almost surely, 2^28504224 is an apocalyptic number.

28504224 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 28504224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47933424).

28504224 is an abundant number, since it is smaller than the sum of its proper divisors (67362624).

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

28504224 is a wasteful number, since it uses less digits than its factorization.

28504224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600 (or 1583 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 28504224 is about 5338.9347252050. The cubic root of 28504224 is about 305.4708270542.

The spelling of 28504224 in words is "twenty-eight million, five hundred four thousand, two hundred twenty-four".