28551617 has 2 divisors, whose sum is σ = 28551618. Its totient is φ = 28551616.

The previous prime is 28551571. The next prime is 28551641. The reversal of 28551617 is 71615582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20349121 + 8202496 = 4511^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 28551617 - 2⁶ = 28551553 is a prime.

It is not a weakly prime, because it can be changed into another prime (28551647) 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, 14275808 + 14275809.

It is an arithmetic number, because the mean of its divisors is an integer number (14275809).

Almost surely, 2^28551617 is an apocalyptic number.

It is an amenable number.

28551617 is a deficient number, since it is larger than the sum of its proper divisors (1).

28551617 is an equidigital number, since it uses as much as digits as its factorization.

28551617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16800, while the sum is 35.

The square root of 28551617 is about 5343.3713140676. The cubic root of 28551617 is about 305.6400319498.

The spelling of 28551617 in words is "twenty-eight million, five hundred fifty-one thousand, six hundred seventeen".