28187232 has 24 divisors (see below), whose sum is σ = 73991736. Its totient is φ = 9395712.

The previous prime is 28187219. The next prime is 28187233. The reversal of 28187232 is 23278182.

It is a tau number, because it is divible by the number of its divisors (24).

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 junction number, because it is equal to n+sod(n) for n = 28187193 and 28187202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187233) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 146713 + ... + 146904.

It is an arithmetic number, because the mean of its divisors is an integer number (3082989).

Almost surely, 2^28187232 is an apocalyptic number.

It is an amenable number.

28187232 is an abundant number, since it is smaller than the sum of its proper divisors (45804504).

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

28187232 is a wasteful number, since it uses less digits than its factorization.

28187232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293630 (or 293622 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 28187232 is about 5309.1649060846. The cubic root of 28187232 is about 304.3342353422.

The spelling of 28187232 in words is "twenty-eight million, one hundred eighty-seven thousand, two hundred thirty-two".