28498309 has 24 divisors (see below), whose sum is σ = 35389760. Its totient is φ = 22415616.

The previous prime is 28498291. The next prime is 28498333. The reversal of 28498309 is 90389482.

It is a happy number.

It is not a de Polignac number, because 28498309 - 2⁵ = 28498277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28498339) 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 23 ways as a sum of consecutive naturals, for example, 293749 + ... + 293845.

Almost surely, 2^28498309 is an apocalyptic number.

It is an amenable number.

28498309 is a deficient number, since it is larger than the sum of its proper divisors (6891451).

28498309 is an equidigital number, since it uses as much as digits as its factorization.

28498309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 170 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 28498309 is about 5338.3807470056. The cubic root of 28498309 is about 305.4496958593.

The spelling of 28498309 in words is "twenty-eight million, four hundred ninety-eight thousand, three hundred nine".