27957898393 has 4 divisors (see below), whose sum is σ = 27958235940. Its totient is φ = 27957560848.

The previous prime is 27957898391. The next prime is 27957898417. The reversal of 27957898393 is 39389875972.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6327725209 + 21630173184 = 79547^2 + 147072^2 .

It is a cyclic number.

It is not a de Polignac number, because 27957898393 - 2¹ = 27957898391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27957898391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49971 + ... + 241687.

It is an arithmetic number, because the mean of its divisors is an integer number (6989558985).

Almost surely, 2^27957898393 is an apocalyptic number.

It is an amenable number.

27957898393 is a deficient number, since it is larger than the sum of its proper divisors (337547).

27957898393 is a wasteful number, since it uses less digits than its factorization.

27957898393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337546.

The product of its digits is 205752960, while the sum is 70.

The spelling of 27957898393 in words is "twenty-seven billion, nine hundred fifty-seven million, eight hundred ninety-eight thousand, three hundred ninety-three".