28382293 has 4 divisors (see below), whose sum is σ = 29149420. Its totient is φ = 27615168.

The previous prime is 28382273. The next prime is 28382311. The reversal of 28382293 is 39228382.

It is a happy number.

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 17994564 + 10387729 = 4242^2 + 3223^2 .

It is a cyclic number.

It is not a de Polignac number, because 28382293 - 2¹⁷ = 28251221 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 767089 = 28382293 / (2 + 8 + 3 + 8 + 2 + 2 + 9 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28382203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383508 + ... + 383581.

It is an arithmetic number, because the mean of its divisors is an integer number (7287355).

Almost surely, 2^28382293 is an apocalyptic number.

It is an amenable number.

28382293 is a deficient number, since it is larger than the sum of its proper divisors (767127).

28382293 is an equidigital number, since it uses as much as digits as its factorization.

28382293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767126.

The product of its digits is 41472, while the sum is 37.

The square root of 28382293 is about 5327.5034490838. The cubic root of 28382293 is about 305.0346390830.

The spelling of 28382293 in words is "twenty-eight million, three hundred eighty-two thousand, two hundred ninety-three".