28442232 has 128 divisors (see below), whose sum is σ = 97305600. Its totient is φ = 7496064.

The previous prime is 28442231. The next prime is 28442273. The reversal of 28442232 is 23224482.

It is a super-3 number, since 3×28442232³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 a junction number, because it is equal to n+sod(n) for n = 28442196 and 28442205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28442231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18933 + ... + 20379.

It is an arithmetic number, because the mean of its divisors is an integer number (760200).

Almost surely, 2^28442232 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 28442232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48652800).

28442232 is an abundant number, since it is smaller than the sum of its proper divisors (68863368).

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

28442232 is a wasteful number, since it uses less digits than its factorization.

28442232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1472 counting only the distinct ones).

The product of its digits is 6144, while the sum is 27.

The square root of 28442232 is about 5333.1259126332. The cubic root of 28442232 is about 305.2492167153.

The spelling of 28442232 in words is "twenty-eight million, four hundred forty-two thousand, two hundred thirty-two".