28690317 has 6 divisors (see below), whose sum is σ = 41441582. Its totient is φ = 19126872.

The previous prime is 28690297. The next prime is 28690379. The reversal of 28690317 is 71309682.

It can be written as a sum of positive squares in only one way, i.e., 14356521 + 14333796 = 3789^2 + 3786^2 .

It is not a de Polignac number, because 28690317 - 2¹¹ = 28688269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28690117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1593898 + ... + 1593915.

Almost surely, 2^28690317 is an apocalyptic number.

It is an amenable number.

28690317 is a deficient number, since it is larger than the sum of its proper divisors (12751265).

28690317 is a wasteful number, since it uses less digits than its factorization.

28690317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3187819 (or 3187816 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28690317 is about 5356.3342875515. The cubic root of 28690317 is about 306.1341523790.

Adding to 28690317 its reverse (71309682), we get a palindrome (99999999).

The spelling of 28690317 in words is "twenty-eight million, six hundred ninety thousand, three hundred seventeen".