27838835991 has 24 divisors (see below), whose sum is σ = 41041428480. Its totient is φ = 18179952336.

The previous prime is 27838835957. The next prime is 27838835993. The reversal of 27838835991 is 19953883872.

27838835991 is a `hidden beast` number, since 2 + 7 + 8 + 38 + 8 + 3 + 599 + 1 = 666.

It is not a de Polignac number, because 27838835991 - 2¹³ = 27838827799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27838835993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 63855 + ... + 244448.

It is an arithmetic number, because the mean of its divisors is an integer number (1710059520).

Almost surely, 2^27838835991 is an apocalyptic number.

27838835991 is a deficient number, since it is larger than the sum of its proper divisors (13202592489).

27838835991 is a wasteful number, since it uses less digits than its factorization.

27838835991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308515 (or 308512 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 63.

The spelling of 27838835991 in words is "twenty-seven billion, eight hundred thirty-eight million, eight hundred thirty-five thousand, nine hundred ninety-one".