27890538689 has 4 divisors (see below), whose sum is σ = 30035964756. Its totient is φ = 25745112624.

The previous prime is 27890538679. The next prime is 27890538743. The reversal of 27890538689 is 98683509872.

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 1900262464 + 25990276225 = 43592^2 + 161215^2 .

It is a cyclic number.

It is not a de Polignac number, because 27890538689 - 2¹⁶ = 27890473153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27890538679) 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, 1072713014 + ... + 1072713039.

It is an arithmetic number, because the mean of its divisors is an integer number (7508991189).

Almost surely, 2^27890538689 is an apocalyptic number.

It is an amenable number.

27890538689 is a deficient number, since it is larger than the sum of its proper divisors (2145426067).

27890538689 is a wasteful number, since it uses less digits than its factorization.

27890538689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145426066.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 27890538689 in words is "twenty-seven billion, eight hundred ninety million, five hundred thirty-eight thousand, six hundred eighty-nine".