28958509 has 2 divisors, whose sum is σ = 28958510. Its totient is φ = 28958508.

The previous prime is 28958507. The next prime is 28958513. The reversal of 28958509 is 90585982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 1814409 = 5210^2 + 1347^2 .

It is a cyclic number.

It is not a de Polignac number, because 28958509 - 2¹ = 28958507 is a prime.

Together with 28958507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28958507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14479254 + 14479255.

It is an arithmetic number, because the mean of its divisors is an integer number (14479255).

Almost surely, 2^28958509 is an apocalyptic number.

It is an amenable number.

28958509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28958509 is an equidigital number, since it uses as much as digits as its factorization.

28958509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 28958509 is about 5381.3110855999. The cubic root of 28958509 is about 307.0850913744.

The spelling of 28958509 in words is "twenty-eight million, nine hundred fifty-eight thousand, five hundred nine".