28117529 has 4 divisors (see below), whose sum is σ = 30673680. Its totient is φ = 25561380.

The previous prime is 28117519. The next prime is 28117543. The reversal of 28117529 is 92571182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28117529 - 2⁸ = 28117273 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28117519) 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, 1278059 + ... + 1278080.

It is an arithmetic number, because the mean of its divisors is an integer number (7668420).

Almost surely, 2^28117529 is an apocalyptic number.

It is an amenable number.

28117529 is a deficient number, since it is larger than the sum of its proper divisors (2556151).

28117529 is a wasteful number, since it uses less digits than its factorization.

28117529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556150.

The product of its digits is 10080, while the sum is 35.

The square root of 28117529 is about 5302.5964394813. The cubic root of 28117529 is about 304.0831699089.

The spelling of 28117529 in words is "twenty-eight million, one hundred seventeen thousand, five hundred twenty-nine".