28601136217 has 2 divisors, whose sum is σ = 28601136218. Its totient is φ = 28601136216.

The previous prime is 28601136199. The next prime is 28601136227. The reversal of 28601136217 is 71263110682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24141701376 + 4459434841 = 155376^2 + 66779^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28601136217 is a prime.

It is not a weakly prime, because it can be changed into another prime (28601136227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14300568108 + 14300568109.

It is an arithmetic number, because the mean of its divisors is an integer number (14300568109).

Almost surely, 2^28601136217 is an apocalyptic number.

It is an amenable number.

28601136217 is a deficient number, since it is larger than the sum of its proper divisors (1).

28601136217 is an equidigital number, since it uses as much as digits as its factorization.

28601136217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

Adding to 28601136217 its reverse (71263110682), we get a palindrome (99864246899).

The spelling of 28601136217 in words is "twenty-eight billion, six hundred one million, one hundred thirty-six thousand, two hundred seventeen".