27729589749 has 4 divisors (see below), whose sum is σ = 36972786336. Its totient is φ = 18486393164.

The previous prime is 27729589733. The next prime is 27729589757. The reversal of 27729589749 is 94798592772.

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 27729589749 - 2⁴ = 27729589733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27729589709) 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, 4621598289 + ... + 4621598294.

It is an arithmetic number, because the mean of its divisors is an integer number (9243196584).

Almost surely, 2^27729589749 is an apocalyptic number.

It is an amenable number.

27729589749 is a deficient number, since it is larger than the sum of its proper divisors (9243196587).

27729589749 is an equidigital number, since it uses as much as digits as its factorization.

27729589749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243196586.

The product of its digits is 160030080, while the sum is 69.

The spelling of 27729589749 in words is "twenty-seven billion, seven hundred twenty-nine million, five hundred eighty-nine thousand, seven hundred forty-nine".