28545197 has 2 divisors, whose sum is σ = 28545198. Its totient is φ = 28545196.

The previous prime is 28545169. The next prime is 28545211. The reversal of 28545197 is 79154582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27573001 + 972196 = 5251^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 28545197 - 2²⁴ = 11767981 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 (28545137) 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, 14272598 + 14272599.

It is an arithmetic number, because the mean of its divisors is an integer number (14272599).

Almost surely, 2^28545197 is an apocalyptic number.

It is an amenable number.

28545197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28545197 is an equidigital number, since it uses as much as digits as its factorization.

28545197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 41.

The square root of 28545197 is about 5342.7705359673. The cubic root of 28545197 is about 305.6171219094.

The spelling of 28545197 in words is "twenty-eight million, five hundred forty-five thousand, one hundred ninety-seven".