27948381393 has 4 divisors (see below), whose sum is σ = 37264508528. Its totient is φ = 18632254260.

The previous prime is 27948381389. The next prime is 27948381401. The reversal of 27948381393 is 39318384972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 27948381393 - 2² = 27948381389 is a prime.

It is a super-2 number, since 2×27948381393² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27948381313) 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, 4658063563 + ... + 4658063568.

It is an arithmetic number, because the mean of its divisors is an integer number (9316127132).

Almost surely, 2^27948381393 is an apocalyptic number.

It is an amenable number.

27948381393 is a deficient number, since it is larger than the sum of its proper divisors (9316127135).

27948381393 is an equidigital number, since it uses as much as digits as its factorization.

27948381393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316127134.

The product of its digits is 7838208, while the sum is 57.

The spelling of 27948381393 in words is "twenty-seven billion, nine hundred forty-eight million, three hundred eighty-one thousand, three hundred ninety-three".