28443312 has 100 divisors (see below), whose sum is σ = 87233256. Its totient is φ = 8916480.

The previous prime is 28443307. The next prime is 28443313. The reversal of 28443312 is 21334482.

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

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28443313) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21387 + ... + 22677.

Almost surely, 2^28443312 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 28443312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43616628).

28443312 is an abundant number, since it is smaller than the sum of its proper divisors (58789944).

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

28443312 is a wasteful number, since it uses less digits than its factorization.

28443312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1328 (or 1313 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 28443312 is about 5333.2271656100. The cubic root of 28443312 is about 305.2530802773.

Adding to 28443312 its reverse (21334482), we get a palindrome (49777794).

The spelling of 28443312 in words is "twenty-eight million, four hundred forty-three thousand, three hundred twelve".