27804988889 has 4 divisors (see below), whose sum is σ = 27899886756. Its totient is φ = 27710091024.

The previous prime is 27804988879. The next prime is 27804988891. The reversal of 27804988889 is 98888940872.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11091670489 + 16713318400 = 105317^2 + 129280^2 .

It is a cyclic number.

It is not a de Polignac number, because 27804988889 - 2⁸ = 27804988633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27804988859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47448494 + ... + 47449079.

It is an arithmetic number, because the mean of its divisors is an integer number (6974971689).

Almost surely, 2^27804988889 is an apocalyptic number.

It is an amenable number.

27804988889 is a deficient number, since it is larger than the sum of its proper divisors (94897867).

27804988889 is an equidigital number, since it uses as much as digits as its factorization.

27804988889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94897866.

The product of its (nonzero) digits is 148635648, while the sum is 71.

The spelling of 27804988889 in words is "twenty-seven billion, eight hundred four million, nine hundred eighty-eight thousand, eight hundred eighty-nine".