28081814417 has 2 divisors, whose sum is σ = 28081814418. Its totient is φ = 28081814416.

The previous prime is 28081814407. The next prime is 28081814443. The reversal of 28081814417 is 71441818082.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28076688721 + 5125696 = 167561^2 + 2264^2 .

It is a cyclic number.

It is not a de Polignac number, because 28081814417 - 2¹² = 28081810321 is a prime.

It is not a weakly prime, because it can be changed into another prime (28081814407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040907208 + 14040907209.

It is an arithmetic number, because the mean of its divisors is an integer number (14040907209).

Almost surely, 2^28081814417 is an apocalyptic number.

It is an amenable number.

28081814417 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081814417 is an equidigital number, since it uses as much as digits as its factorization.

28081814417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 114688, while the sum is 44.

The spelling of 28081814417 in words is "twenty-eight billion, eighty-one million, eight hundred fourteen thousand, four hundred seventeen".