28229517 has 12 divisors (see below), whose sum is σ = 40957020. Its totient is φ = 18736128.

The previous prime is 28229507. The next prime is 28229521. The reversal of 28229517 is 71592282.

It can be written as a sum of positive squares in 2 ways, for example, as 12595401 + 15634116 = 3549^2 + 3954^2 .

It is not a de Polignac number, because 28229517 - 2⁴ = 28229501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28229507) 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 in 11 ways as a sum of consecutive naturals, for example, 4788 + ... + 8909.

It is an arithmetic number, because the mean of its divisors is an integer number (3413085).

Almost surely, 2^28229517 is an apocalyptic number.

It is an amenable number.

28229517 is a deficient number, since it is larger than the sum of its proper divisors (12727503).

28229517 is a wasteful number, since it uses less digits than its factorization.

28229517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13932 (or 13929 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 28229517 is about 5313.1456784094. The cubic root of 28229517 is about 304.4863413677.

The spelling of 28229517 in words is "twenty-eight million, two hundred twenty-nine thousand, five hundred seventeen".