28933389 has 16 divisors (see below), whose sum is σ = 43675200. Its totient is φ = 18924048.

The previous prime is 28933357. The next prime is 28933391. The reversal of 28933389 is 98333982.

It is not a de Polignac number, because 28933389 - 2⁵ = 28933357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28933339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8679 + ... + 11540.

It is an arithmetic number, because the mean of its divisors is an integer number (2729700).

Almost surely, 2^28933389 is an apocalyptic number.

It is an amenable number.

28933389 is a deficient number, since it is larger than the sum of its proper divisors (14741811).

28933389 is a wasteful number, since it uses less digits than its factorization.

28933389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20281 (or 20275 counting only the distinct ones).

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

The square root of 28933389 is about 5378.9765755207. The cubic root of 28933389 is about 306.9962722406.

The spelling of 28933389 in words is "twenty-eight million, nine hundred thirty-three thousand, three hundred eighty-nine".