27910489391 has 4 divisors (see below), whose sum is σ = 28130257152. Its totient is φ = 27690721632.

The previous prime is 27910489361. The next prime is 27910489433. The reversal of 27910489391 is 19398401972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27910489391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27910489331) 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, 109883690 + ... + 109883943.

It is an arithmetic number, because the mean of its divisors is an integer number (7032564288).

Almost surely, 2^27910489391 is an apocalyptic number.

27910489391 is a deficient number, since it is larger than the sum of its proper divisors (219767761).

27910489391 is a wasteful number, since it uses less digits than its factorization.

27910489391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219767760.

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 27910489391 in words is "twenty-seven billion, nine hundred ten million, four hundred eighty-nine thousand, three hundred ninety-one".