28088887163891 has 2 divisors, whose sum is σ = 28088887163892. Its totient is φ = 28088887163890.

The previous prime is 28088887163867. The next prime is 28088887163963. The reversal of 28088887163891 is 19836178888082.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28088887163891 - 2¹⁴ = 28088887147507 is a prime.

It is not a weakly prime, because it can be changed into another prime (28088887163861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14044443581945 + 14044443581946.

It is an arithmetic number, because the mean of its divisors is an integer number (14044443581946).

Almost surely, 2^{28088887163891} is an apocalyptic number.

28088887163891 is a deficient number, since it is larger than the sum of its proper divisors (1).

28088887163891 is an equidigital number, since it uses as much as digits as its factorization.

28088887163891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 594542592, while the sum is 77.

The spelling of 28088887163891 in words is "twenty-eight trillion, eighty-eight billion, eight hundred eighty-seven million, one hundred sixty-three thousand, eight hundred ninety-one".