28504432 has 20 divisors (see below), whose sum is σ = 60248376. Its totient is φ = 12956480.

The previous prime is 28504417. The next prime is 28504433. The reversal of 28504432 is 23440582.

It is a self number, because there is not a number n which added to its sum of digits gives 28504432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28504433) 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 3 ways as a sum of consecutive naturals, for example, 80803 + ... + 81154.

Almost surely, 2^28504432 is an apocalyptic number.

28504432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28504432 is an abundant number, since it is smaller than the sum of its proper divisors (31743944).

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

28504432 is a wasteful number, since it uses less digits than its factorization.

28504432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161976 (or 161970 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 28504432 is about 5338.9542047109. The cubic root of 28504432 is about 305.4715700760.

The spelling of 28504432 in words is "twenty-eight million, five hundred four thousand, four hundred thirty-two".