28390997181847 has 2 divisors, whose sum is σ = 28390997181848. Its totient is φ = 28390997181846.

The previous prime is 28390997181829. The next prime is 28390997181889. The reversal of 28390997181847 is 74818179909382.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28390997181847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28390997181047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14195498590923 + 14195498590924.

It is an arithmetic number, because the mean of its divisors is an integer number (14195498590924).

Almost surely, 2^{28390997181847} is an apocalyptic number.

28390997181847 is a deficient number, since it is larger than the sum of its proper divisors (1).

28390997181847 is an equidigital number, since it uses as much as digits as its factorization.

28390997181847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 438939648, while the sum is 76.

The spelling of 28390997181847 in words is "twenty-eight trillion, three hundred ninety billion, nine hundred ninety-seven million, one hundred eighty-one thousand, eight hundred forty-seven".