28550317 has 2 divisors, whose sum is σ = 28550318. Its totient is φ = 28550316.

The previous prime is 28550311. The next prime is 28550339. The reversal of 28550317 is 71305582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28366276 + 184041 = 5326^2 + 429^2 .

It is a cyclic number.

It is not a de Polignac number, because 28550317 - 2¹¹ = 28548269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28550311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14275158 + 14275159.

It is an arithmetic number, because the mean of its divisors is an integer number (14275159).

Almost surely, 2^28550317 is an apocalyptic number.

It is an amenable number.

28550317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28550317 is an equidigital number, since it uses as much as digits as its factorization.

28550317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 28550317 is about 5343.2496666355. The cubic root of 28550317 is about 305.6353931224.

Adding to 28550317 its reverse (71305582), we get a palindrome (99855899).

The spelling of 28550317 in words is "twenty-eight million, five hundred fifty thousand, three hundred seventeen".