28205897 has 2 divisors, whose sum is σ = 28205898. Its totient is φ = 28205896.

The previous prime is 28205857. The next prime is 28205921. The reversal of 28205897 is 79850282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21631801 + 6574096 = 4651^2 + 2564^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28205897 is a prime.

It is not a weakly prime, because it can be changed into another prime (28205857) 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, 14102948 + 14102949.

It is an arithmetic number, because the mean of its divisors is an integer number (14102949).

Almost surely, 2^28205897 is an apocalyptic number.

It is an amenable number.

28205897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28205897 is an equidigital number, since it uses as much as digits as its factorization.

28205897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 28205897 is about 5310.9224245888. The cubic root of 28205897 is about 304.4013951252.

The spelling of 28205897 in words is "twenty-eight million, two hundred five thousand, eight hundred ninety-seven".