28818197 has 2 divisors, whose sum is σ = 28818198. Its totient is φ = 28818196.

The previous prime is 28818187. The next prime is 28818211. The reversal of 28818197 is 79181882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28665316 + 152881 = 5354^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 28818197 - 2¹⁴ = 28801813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28818187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14409098 + 14409099.

It is an arithmetic number, because the mean of its divisors is an integer number (14409099).

Almost surely, 2^28818197 is an apocalyptic number.

It is an amenable number.

28818197 is a deficient number, since it is larger than the sum of its proper divisors (1).

28818197 is an equidigital number, since it uses as much as digits as its factorization.

28818197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 44.

The square root of 28818197 is about 5368.2582836522. The cubic root of 28818197 is about 306.5883173874.

The spelling of 28818197 in words is "twenty-eight million, eight hundred eighteen thousand, one hundred ninety-seven".