28849509 has 12 divisors (see below), whose sum is σ = 44877196. Its totient is φ = 17753472.

The previous prime is 28849507. The next prime is 28849511. The reversal of 28849509 is 90594882.

It is an interprime number because it is at equal distance from previous prime (28849507) and next prime (28849511).

It can be written as a sum of positive squares in 2 ways, for example, as 13616100 + 15233409 = 3690^2 + 3903^2 .

It is not a de Polignac number, because 28849509 - 2¹ = 28849507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28849507) 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 11 ways as a sum of consecutive naturals, for example, 123172 + ... + 123405.

Almost surely, 2^28849509 is an apocalyptic number.

It is an amenable number.

28849509 is a deficient number, since it is larger than the sum of its proper divisors (16027687).

28849509 is a wasteful number, since it uses less digits than its factorization.

28849509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246596 (or 246593 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 28849509 is about 5371.1738940384. The cubic root of 28849509 is about 306.6993169133.

The spelling of 28849509 in words is "twenty-eight million, eight hundred forty-nine thousand, five hundred nine".