28918339 has 4 divisors (see below), whose sum is σ = 29350024. Its totient is φ = 28486656.

The previous prime is 28918333. The next prime is 28918363. The reversal of 28918339 is 93381982.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28918339 - 2²¹ = 26821187 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28918295 and 28918304.

It is not an unprimeable number, because it can be changed into a prime (28918333) 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, 215742 + ... + 215875.

It is an arithmetic number, because the mean of its divisors is an integer number (7337506).

Almost surely, 2^28918339 is an apocalyptic number.

28918339 is a deficient number, since it is larger than the sum of its proper divisors (431685).

28918339 is an equidigital number, since it uses as much as digits as its factorization.

28918339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431684.

The product of its digits is 93312, while the sum is 43.

The square root of 28918339 is about 5377.5774285453. The cubic root of 28918339 is about 306.9430339187.

The spelling of 28918339 in words is "twenty-eight million, nine hundred eighteen thousand, three hundred thirty-nine".