28133244 has 60 divisors (see below), whose sum is σ = 75945408. Its totient is φ = 9072000.

The previous prime is 28133221. The next prime is 28133267. The reversal of 28133244 is 44233182.

It is an interprime number because it is at equal distance from previous prime (28133221) and next prime (28133267).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8644 + ... + 11444.

Almost surely, 2^28133244 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 28133244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37972704).

28133244 is an abundant number, since it is smaller than the sum of its proper divisors (47812164).

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

28133244 is a wasteful number, since it uses less digits than its factorization.

28133244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848 (or 2837 counting only the distinct ones).

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

The square root of 28133244 is about 5304.0780537243. The cubic root of 28133244 is about 304.1398104601.

The spelling of 28133244 in words is "twenty-eight million, one hundred thirty-three thousand, two hundred forty-four".