27999374865 has 64 divisors (see below), whose sum is σ = 57779343360. Its totient is φ = 11234845440.

The previous prime is 27999374861. The next prime is 27999374869. The reversal of 27999374865 is 56847399972.

It is an interprime number because it is at equal distance from previous prime (27999374861) and next prime (27999374869).

It is not a de Polignac number, because 27999374865 - 2² = 27999374861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27999374865.

It is not an unprimeable number, because it can be changed into a prime (27999374861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 384469 + ... + 451458.

It is an arithmetic number, because the mean of its divisors is an integer number (902802240).

Almost surely, 2^27999374865 is an apocalyptic number.

It is an amenable number.

27999374865 is an abundant number, since it is smaller than the sum of its proper divisors (29779968495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27999374865 is a wasteful number, since it uses less digits than its factorization.

27999374865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835982.

The product of its digits is 205752960, while the sum is 69.

The spelling of 27999374865 in words is "twenty-seven billion, nine hundred ninety-nine million, three hundred seventy-four thousand, eight hundred sixty-five".