28513897 has 2 divisors, whose sum is σ = 28513898. Its totient is φ = 28513896.

The previous prime is 28513883. The next prime is 28513921. The reversal of 28513897 is 79831582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28344976 + 168921 = 5324^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 28513897 - 2¹¹ = 28511849 is a prime.

It is not a weakly prime, because it can be changed into another prime (28513867) 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, 14256948 + 14256949.

It is an arithmetic number, because the mean of its divisors is an integer number (14256949).

Almost surely, 2^28513897 is an apocalyptic number.

It is an amenable number.

28513897 is a deficient number, since it is larger than the sum of its proper divisors (1).

28513897 is an equidigital number, since it uses as much as digits as its factorization.

28513897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 28513897 is about 5339.8405406903. The cubic root of 28513897 is about 305.5053773151.

The spelling of 28513897 in words is "twenty-eight million, five hundred thirteen thousand, eight hundred ninety-seven".