27891381947 has 48 divisors (see below), whose sum is σ = 33440688000. Its totient is φ = 23057798400.

The previous prime is 27891381937. The next prime is 27891382019. The reversal of 27891381947 is 74918319872.

It is not a de Polignac number, because 27891381947 - 2⁶ = 27891381883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27891381937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 55894304 + ... + 55894802.

It is an arithmetic number, because the mean of its divisors is an integer number (696681000).

Almost surely, 2^27891381947 is an apocalyptic number.

27891381947 is a deficient number, since it is larger than the sum of its proper divisors (5549306053).

27891381947 is a wasteful number, since it uses less digits than its factorization.

27891381947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 911 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 59.

The spelling of 27891381947 in words is "twenty-seven billion, eight hundred ninety-one million, three hundred eighty-one thousand, nine hundred forty-seven".