28824372 has 18 divisors (see below), whose sum is σ = 72861698. Its totient is φ = 9608112.

The previous prime is 28824371. The next prime is 28824403. The reversal of 28824372 is 27342882.

28824372 is a `hidden beast` number, since 288 + 2 + 4 + 372 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21566736 + 7257636 = 4644^2 + 2694^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 800677 = 28824372 / (2 + 8 + 8 + 2 + 4 + 3 + 7 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28824371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 400303 + ... + 400374.

Almost surely, 2^28824372 is an apocalyptic number.

It is an amenable number.

28824372 is an abundant number, since it is smaller than the sum of its proper divisors (44037326).

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

28824372 is a wasteful number, since it uses less digits than its factorization.

28824372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800687 (or 800682 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 28824372 is about 5368.8333928331. The cubic root of 28824372 is about 306.6102138261.

The spelling of 28824372 in words is "twenty-eight million, eight hundred twenty-four thousand, three hundred seventy-two".