27400723481 has 4 divisors (see below), whose sum is σ = 27428207652. Its totient is φ = 27373239312.

The previous prime is 27400723453. The next prime is 27400723543. The reversal of 27400723481 is 18432700472.

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 22044825625 + 5355897856 = 148475^2 + 73184^2 .

It is a cyclic number.

It is not a de Polignac number, because 27400723481 - 2⁶ = 27400723417 is a prime.

It is a super-2 number, since 2×27400723481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (27400723421) 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, 13740590 + ... + 13742583.

It is an arithmetic number, because the mean of its divisors is an integer number (6857051913).

Almost surely, 2^27400723481 is an apocalyptic number.

It is an amenable number.

27400723481 is a deficient number, since it is larger than the sum of its proper divisors (27484171).

27400723481 is an equidigital number, since it uses as much as digits as its factorization.

27400723481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27484170.

The product of its (nonzero) digits is 75264, while the sum is 38.

The spelling of 27400723481 in words is "twenty-seven billion, four hundred million, seven hundred twenty-three thousand, four hundred eighty-one".