28098197 has 2 divisors, whose sum is σ = 28098198. Its totient is φ = 28098196.

The previous prime is 28098193. The next prime is 28098209. The reversal of 28098197 is 79189082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16982641 + 11115556 = 4121^2 + 3334^2 .

It is a cyclic number.

It is not a de Polignac number, because 28098197 - 2² = 28098193 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 (28098193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14049098 + 14049099.

It is an arithmetic number, because the mean of its divisors is an integer number (14049099).

Almost surely, 2^28098197 is an apocalyptic number.

It is an amenable number.

28098197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28098197 is an equidigital number, since it uses as much as digits as its factorization.

28098197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 28098197 is about 5300.7732454803. The cubic root of 28098197 is about 304.0134638831.

The spelling of 28098197 in words is "twenty-eight million, ninety-eight thousand, one hundred ninety-seven".