28787184 has 80 divisors (see below), whose sum is σ = 84910240. Its totient is φ = 9331200.

The previous prime is 28787183. The next prime is 28787203. The reversal of 28787184 is 48178782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28787183) 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, 15084 + ... + 16884.

It is an arithmetic number, because the mean of its divisors is an integer number (1061378).

Almost surely, 2^28787184 is an apocalyptic number.

28787184 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 28787184, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42455120).

28787184 is an abundant number, since it is smaller than the sum of its proper divisors (56123056).

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

28787184 is a wasteful number, since it uses less digits than its factorization.

28787184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855 (or 1843 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 28787184 is about 5365.3689528307. The cubic root of 28787184 is about 306.4782985184.

The spelling of 28787184 in words is "twenty-eight million, seven hundred eighty-seven thousand, one hundred eighty-four".