27785368489 has 4 divisors (see below), whose sum is σ = 27845640900. Its totient is φ = 27725096080.

The previous prime is 27785368469. The next prime is 27785368543. The reversal of 27785368489 is 98486358772.

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 7802718889 + 19982649600 = 88333^2 + 141360^2 .

It is a cyclic number.

It is not a de Polignac number, because 27785368489 - 2⁹ = 27785367977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27785368469) 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, 30135514 + ... + 30136435.

It is an arithmetic number, because the mean of its divisors is an integer number (6961410225).

Almost surely, 2^27785368489 is an apocalyptic number.

It is an amenable number.

27785368489 is a deficient number, since it is larger than the sum of its proper divisors (60272411).

27785368489 is an equidigital number, since it uses as much as digits as its factorization.

27785368489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60272410.

The product of its digits is 162570240, while the sum is 67.

The spelling of 27785368489 in words is "twenty-seven billion, seven hundred eighty-five million, three hundred sixty-eight thousand, four hundred eighty-nine".