28317917 has 2 divisors, whose sum is σ = 28317918. Its totient is φ = 28317916.

The previous prime is 28317907. The next prime is 28317943. The reversal of 28317917 is 71971382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26275876 + 2042041 = 5126^2 + 1429^2 .

It is a cyclic number.

It is not a de Polignac number, because 28317917 - 2¹⁶ = 28252381 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 (28317907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14158958 + 14158959.

It is an arithmetic number, because the mean of its divisors is an integer number (14158959).

Almost surely, 2^28317917 is an apocalyptic number.

It is an amenable number.

28317917 is a deficient number, since it is larger than the sum of its proper divisors (1).

28317917 is an equidigital number, since it uses as much as digits as its factorization.

28317917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 28317917 is about 5321.4581648266. The cubic root of 28317917 is about 304.8038405435.

The spelling of 28317917 in words is "twenty-eight million, three hundred seventeen thousand, nine hundred seventeen".