27840511481 has 4 divisors (see below), whose sum is σ = 27846329700. Its totient is φ = 27834693264.

The previous prime is 27840511477. The next prime is 27840511487. The reversal of 27840511481 is 18411504872.

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 16766106256 + 11074405225 = 129484^2 + 105235^2 .

It is a cyclic number.

It is not a de Polignac number, because 27840511481 - 2² = 27840511477 is a prime.

It is a super-2 number, since 2×27840511481² (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 (27840511487) 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, 2901926 + ... + 2911503.

It is an arithmetic number, because the mean of its divisors is an integer number (6961582425).

Almost surely, 2^27840511481 is an apocalyptic number.

It is an amenable number.

27840511481 is a deficient number, since it is larger than the sum of its proper divisors (5818219).

27840511481 is an equidigital number, since it uses as much as digits as its factorization.

27840511481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5818218.

The product of its (nonzero) digits is 71680, while the sum is 41.

The spelling of 27840511481 in words is "twenty-seven billion, eight hundred forty million, five hundred eleven thousand, four hundred eighty-one".