28280339 has 4 divisors (see below), whose sum is σ = 29192640. Its totient is φ = 27368040.

The previous prime is 28280327. The next prime is 28280347. The reversal of 28280339 is 93308282.

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

It is a de Polignac number, because none of the positive numbers 2^k-28280339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28280299 and 28280308.

It is not an unprimeable number, because it can be changed into a prime (28580339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456104 + ... + 456165.

It is an arithmetic number, because the mean of its divisors is an integer number (7298160).

Almost surely, 2^28280339 is an apocalyptic number.

28280339 is a deficient number, since it is larger than the sum of its proper divisors (912301).

28280339 is an equidigital number, since it uses as much as digits as its factorization.

28280339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912300.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 28280339 is about 5317.9261935458. The cubic root of 28280339 is about 304.6689555174.

The spelling of 28280339 in words is "twenty-eight million, two hundred eighty thousand, three hundred thirty-nine".