28517617 has 2 divisors, whose sum is σ = 28517618. Its totient is φ = 28517616.

The previous prime is 28517611. The next prime is 28517623. The reversal of 28517617 is 71671582.

It is a balanced prime because it is at equal distance from previous prime (28517611) and next prime (28517623).

It can be written as a sum of positive squares in only one way, i.e., 27499536 + 1018081 = 5244^2 + 1009^2 .

It is a cyclic number.

It is not a de Polignac number, because 28517617 - 2²³ = 20129009 is a prime.

It is not a weakly prime, because it can be changed into another prime (28517611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14258808 + 14258809.

It is an arithmetic number, because the mean of its divisors is an integer number (14258809).

Almost surely, 2^28517617 is an apocalyptic number.

It is an amenable number.

28517617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28517617 is an equidigital number, since it uses as much as digits as its factorization.

28517617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23520, while the sum is 37.

The square root of 28517617 is about 5340.1888543384. The cubic root of 28517617 is about 305.5186624229.

The spelling of 28517617 in words is "twenty-eight million, five hundred seventeen thousand, six hundred seventeen".