27985970865 has 48 divisors (see below), whose sum is σ = 47718073728. Its totient is φ = 14002716672.

The previous prime is 27985970731. The next prime is 27985970893. The reversal of 27985970865 is 56807958972.

It is a happy number.

It is not a de Polignac number, because 27985970865 - 2¹² = 27985966769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27985970796 and 27985970805.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 532657 + ... + 582833.

It is an arithmetic number, because the mean of its divisors is an integer number (994126536).

Almost surely, 2^27985970865 is an apocalyptic number.

It is an amenable number.

27985970865 is a deficient number, since it is larger than the sum of its proper divisors (19732102863).

27985970865 is a wasteful number, since it uses less digits than its factorization.

27985970865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50326 (or 50307 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 66.

The spelling of 27985970865 in words is "twenty-seven billion, nine hundred eighty-five million, nine hundred seventy thousand, eight hundred sixty-five".