27888643809 has 36 divisors (see below), whose sum is σ = 43816840704. Its totient is φ = 17085073824.

The previous prime is 27888643807. The next prime is 27888643823. The reversal of 27888643809 is 90834688872.

It is not a de Polignac number, because 27888643809 - 2¹ = 27888643807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27888643807) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 298072 + ... + 380294.

It is an arithmetic number, because the mean of its divisors is an integer number (1217134464).

Almost surely, 2^27888643809 is an apocalyptic number.

It is an amenable number.

27888643809 is a deficient number, since it is larger than the sum of its proper divisors (15928196895).

27888643809 is a wasteful number, since it uses less digits than its factorization.

27888643809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82478 (or 82462 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 63.

The spelling of 27888643809 in words is "twenty-seven billion, eight hundred eighty-eight million, six hundred forty-three thousand, eight hundred nine".