27728745309 has 12 divisors (see below), whose sum is σ = 41536063296. Its totient is φ = 18485830044.

The previous prime is 27728745287. The next prime is 27728745311. The reversal of 27728745309 is 90354782772.

27728745309 is a `hidden beast` number, since 27 + 7 + 2 + 87 + 4 + 530 + 9 = 666.

It is not a de Polignac number, because 27728745309 - 2¹¹ = 27728743261 is a prime.

It is a super-2 number, since 2×27728745309² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728740309) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 57054789 + ... + 57055274.

It is an arithmetic number, because the mean of its divisors is an integer number (3461338608).

Almost surely, 2^27728745309 is an apocalyptic number.

It is an amenable number.

27728745309 is a deficient number, since it is larger than the sum of its proper divisors (13807317987).

27728745309 is an equidigital number, since it uses as much as digits as its factorization.

27728745309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114110078 (or 114110066 counting only the distinct ones).

The product of its (nonzero) digits is 5927040, while the sum is 54.

The spelling of 27728745309 in words is "twenty-seven billion, seven hundred twenty-eight million, seven hundred forty-five thousand, three hundred nine".