27478891441 has 4 divisors (see below), whose sum is σ = 28117935472. Its totient is φ = 26839847412.

The previous prime is 27478891439. The next prime is 27478891459. The reversal of 27478891441 is 14419887472.

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 a cyclic number.

It is not a de Polignac number, because 27478891441 - 2¹ = 27478891439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27478891471) 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, 319521951 + ... + 319522036.

It is an arithmetic number, because the mean of its divisors is an integer number (7029483868).

Almost surely, 2^27478891441 is an apocalyptic number.

It is an amenable number.

27478891441 is a deficient number, since it is larger than the sum of its proper divisors (639044031).

27478891441 is an equidigital number, since it uses as much as digits as its factorization.

27478891441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639044030.

The product of its digits is 3612672, while the sum is 55.

The spelling of 27478891441 in words is "twenty-seven billion, four hundred seventy-eight million, eight hundred ninety-one thousand, four hundred forty-one".