27965619889 has 4 divisors (see below), whose sum is σ = 29437494640. Its totient is φ = 26493745140.

The previous prime is 27965619821. The next prime is 27965619893. The reversal of 27965619889 is 98891656972.

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 27965619889 - 2¹⁵ = 27965587121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27965619589) 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, 735937347 + ... + 735937384.

It is an arithmetic number, because the mean of its divisors is an integer number (7359373660).

Almost surely, 2^27965619889 is an apocalyptic number.

It is an amenable number.

27965619889 is a deficient number, since it is larger than the sum of its proper divisors (1471874751).

27965619889 is a wasteful number, since it uses less digits than its factorization.

27965619889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471874750.

The product of its digits is 117573120, while the sum is 70.

The spelling of 27965619889 in words is "twenty-seven billion, nine hundred sixty-five million, six hundred nineteen thousand, eight hundred eighty-nine".