28512117 has 12 divisors (see below), whose sum is σ = 41340780. Its totient is φ = 18935808.

The previous prime is 28512101. The next prime is 28512131. The reversal of 28512117 is 71121582.

It can be written as a sum of positive squares in 2 ways, for example, as 9771876 + 18740241 = 3126^2 + 4329^2 .

It is not a de Polignac number, because 28512117 - 2⁴ = 28512101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28512137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3468 + ... + 8309.

It is an arithmetic number, because the mean of its divisors is an integer number (3445065).

Almost surely, 2^28512117 is an apocalyptic number.

It is an amenable number.

28512117 is a deficient number, since it is larger than the sum of its proper divisors (12828663).

28512117 is a wasteful number, since it uses less digits than its factorization.

28512117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12052 (or 12049 counting only the distinct ones).

The product of its digits is 1120, while the sum is 27.

The square root of 28512117 is about 5339.6738664454. The cubic root of 28512117 is about 305.4990200538.

Adding to 28512117 its reverse (71121582), we get a palindrome (99633699).

The spelling of 28512117 in words is "twenty-eight million, five hundred twelve thousand, one hundred seventeen".