28638317 has 2 divisors, whose sum is σ = 28638318. Its totient is φ = 28638316.

The previous prime is 28638307. The next prime is 28638359. The reversal of 28638317 is 71383682.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 6180196 = 4739^2 + 2486^2 .

It is a cyclic number.

It is not a de Polignac number, because 28638317 - 2⁸ = 28638061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28638307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14319158 + 14319159.

It is an arithmetic number, because the mean of its divisors is an integer number (14319159).

Almost surely, 2^28638317 is an apocalyptic number.

It is an amenable number.

28638317 is a deficient number, since it is larger than the sum of its proper divisors (1).

28638317 is an equidigital number, since it uses as much as digits as its factorization.

28638317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The square root of 28638317 is about 5351.4780201361. The cubic root of 28638317 is about 305.9490887433.

The spelling of 28638317 in words is "twenty-eight million, six hundred thirty-eight thousand, three hundred seventeen".