28935509 has 6 divisors (see below), whose sum is σ = 29494626. Its totient is φ = 28386800.

The previous prime is 28935469. The next prime is 28935539. The reversal of 28935509 is 90553982.

It can be written as a sum of positive squares in 3 ways, for example, as 18190225 + 10745284 = 4265^2 + 3278^2 .

It is not a de Polignac number, because 28935509 - 2⁸ = 28935253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28935539) 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 5 ways as a sum of consecutive naturals, for example, 2342 + ... + 7959.

It is an arithmetic number, because the mean of its divisors is an integer number (4915771).

Almost surely, 2^28935509 is an apocalyptic number.

It is an amenable number.

28935509 is a deficient number, since it is larger than the sum of its proper divisors (559117).

28935509 is an equidigital number, since it uses as much as digits as its factorization.

28935509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10407 (or 10354 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 28935509 is about 5379.1736354202. The cubic root of 28935509 is about 307.0037701086.

The spelling of 28935509 in words is "twenty-eight million, nine hundred thirty-five thousand, five hundred nine".