28081814407 has 2 divisors, whose sum is σ = 28081814408. Its totient is φ = 28081814406.

The previous prime is 28081814399. The next prime is 28081814417. The reversal of 28081814407 is 70441818082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28081814407 - 2³ = 28081814399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28081814417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040907203 + 14040907204.

It is an arithmetic number, because the mean of its divisors is an integer number (14040907204).

Almost surely, 2^28081814407 is an apocalyptic number.

28081814407 is a deficient number, since it is larger than the sum of its proper divisors (1).

28081814407 is an equidigital number, since it uses as much as digits as its factorization.

28081814407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114688, while the sum is 43.

The spelling of 28081814407 in words is "twenty-eight billion, eighty-one million, eight hundred fourteen thousand, four hundred seven".