27400772281 has 4 divisors (see below), whose sum is σ = 28141333732. Its totient is φ = 26660210832.

The previous prime is 27400772251. The next prime is 27400772297. The reversal of 27400772281 is 18227700472.

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 15835705600 + 11565066681 = 125840^2 + 107541^2 .

It is a cyclic number.

It is not a de Polignac number, because 27400772281 - 2¹¹ = 27400770233 is a prime.

It is a super-2 number, since 2×27400772281² (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 (27400772221) 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, 370280670 + ... + 370280743.

It is an arithmetic number, because the mean of its divisors is an integer number (7035333433).

Almost surely, 2^27400772281 is an apocalyptic number.

It is an amenable number.

27400772281 is a deficient number, since it is larger than the sum of its proper divisors (740561451).

27400772281 is an equidigital number, since it uses as much as digits as its factorization.

27400772281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 740561450.

The product of its (nonzero) digits is 87808, while the sum is 40.

The spelling of 27400772281 in words is "twenty-seven billion, four hundred million, seven hundred seventy-two thousand, two hundred eighty-one".