27328387969 has 3 divisors (see below), whose sum is σ = 27328553283. Its totient is φ = 27328222656.

The previous prime is 27328387937. The next prime is 27328387981. The reversal of 27328387969 is 96978382372.

The square root of 27328387969 is 165313.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 330625 + 27328057344 = 575^2 + 165312^2 .

It is not a de Polignac number, because 27328387969 - 2⁵ = 27328387937 is a prime.

It is a super-2 number, since 2×27328387969² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27328387969.

It is not an unprimeable number, because it can be changed into a prime (27328387909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 82657 + ... + 247969.

It is an arithmetic number, because the mean of its divisors is an integer number (9109517761).

Almost surely, 2^27328387969 is an apocalyptic number.

27328387969 is the 165313-rd square number.

27328387969 is the 82657-th centered octagonal number.

It is an amenable number.

27328387969 is a deficient number, since it is larger than the sum of its proper divisors (165314).

27328387969 is an frugal number, since it uses more digits than its factorization.

27328387969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330626 (or 165313 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 64.

Multiplying 27328387969 by its sum of digits (64), we get a square (1749016830016 = 1322504²).

The spelling of 27328387969 in words is "twenty-seven billion, three hundred twenty-eight million, three hundred eighty-seven thousand, nine hundred sixty-nine".