28508197 has 2 divisors, whose sum is σ = 28508198. Its totient is φ = 28508196.

The previous prime is 28508191. The next prime is 28508209. The reversal of 28508197 is 79180582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24611521 + 3896676 = 4961^2 + 1974^2 .

It is a cyclic number.

It is not a de Polignac number, because 28508197 - 2¹⁹ = 27983909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28508191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14254098 + 14254099.

It is an arithmetic number, because the mean of its divisors is an integer number (14254099).

Almost surely, 2^28508197 is an apocalyptic number.

It is an amenable number.

28508197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28508197 is an equidigital number, since it uses as much as digits as its factorization.

28508197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28508197 is about 5339.3067902116. The cubic root of 28508197 is about 305.4850188598.

The spelling of 28508197 in words is "twenty-eight million, five hundred eight thousand, one hundred ninety-seven".