27728760817 has 4 divisors (see below), whose sum is σ = 28119306816. Its totient is φ = 27338214820.

The previous prime is 27728760803. The next prime is 27728760863. The reversal of 27728760817 is 71806782772.

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 27728760817 - 2²³ = 27720372209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27728760317) 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, 195272893 + ... + 195273034.

It is an arithmetic number, because the mean of its divisors is an integer number (7029826704).

Almost surely, 2^27728760817 is an apocalyptic number.

It is an amenable number.

27728760817 is a deficient number, since it is larger than the sum of its proper divisors (390545999).

27728760817 is an equidigital number, since it uses as much as digits as its factorization.

27728760817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390545998.

The product of its (nonzero) digits is 3687936, while the sum is 55.

The spelling of 27728760817 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred sixty thousand, eight hundred seventeen".