28008161 has 2 divisors, whose sum is σ = 28008162. Its totient is φ = 28008160.

The previous prime is 28008139. The next prime is 28008173. The reversal of 28008161 is 16180082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 10627600 = 4169^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 28008161 - 2¹⁰ = 28007137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28008161.

It is not a weakly prime, because it can be changed into another prime (28008661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14004080 + 14004081.

It is an arithmetic number, because the mean of its divisors is an integer number (14004081).

Almost surely, 2^28008161 is an apocalyptic number.

It is an amenable number.

28008161 is a deficient number, since it is larger than the sum of its proper divisors (1).

28008161 is an equidigital number, since it uses as much as digits as its factorization.

28008161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 28008161 is about 5292.2737079633. The cubic root of 28008161 is about 303.6883962296.

The spelling of 28008161 in words is "twenty-eight million, eight thousand, one hundred sixty-one".