28832389 has 4 divisors (see below), whose sum is σ = 29535660. Its totient is φ = 28129120.

The previous prime is 28832381. The next prime is 28832413. The reversal of 28832389 is 98323882.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9180900 + 19651489 = 3030^2 + 4433^2 .

It is a cyclic number.

It is not a de Polignac number, because 28832389 - 2³ = 28832381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28832381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351574 + ... + 351655.

It is an arithmetic number, because the mean of its divisors is an integer number (7383915).

Almost surely, 2^28832389 is an apocalyptic number.

It is an amenable number.

28832389 is a deficient number, since it is larger than the sum of its proper divisors (703271).

28832389 is an equidigital number, since it uses as much as digits as its factorization.

28832389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703270.

The product of its digits is 165888, while the sum is 43.

The square root of 28832389 is about 5369.5799649507. The cubic root of 28832389 is about 306.6386372985.

The spelling of 28832389 in words is "twenty-eight million, eight hundred thirty-two thousand, three hundred eighty-nine".