28339389 has 24 divisors (see below), whose sum is σ = 45721312. Its totient is φ = 17437680.

The previous prime is 28339369. The next prime is 28339397. The reversal of 28339389 is 98393382.

It is not a de Polignac number, because 28339389 - 2¹⁷ = 28208317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28339309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1327 + ... + 7644.

Almost surely, 2^28339389 is an apocalyptic number.

It is an amenable number.

28339389 is a deficient number, since it is larger than the sum of its proper divisors (17381923).

28339389 is an equidigital number, since it uses as much as digits as its factorization.

28339389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8999 (or 8987 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 28339389 is about 5323.4752746679. The cubic root of 28339389 is about 304.8808600336.

The spelling of 28339389 in words is "twenty-eight million, three hundred thirty-nine thousand, three hundred eighty-nine".