27697989619 has 4 divisors (see below), whose sum is σ = 29327283144. Its totient is φ = 26068696096.

The previous prime is 27697989607. The next prime is 27697989629. The reversal of 27697989619 is 91698979672.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27697989619 - 2¹³ = 27697981427 is a prime.

It is a super-2 number, since 2×27697989619² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27697989629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814646737 + ... + 814646770.

It is an arithmetic number, because the mean of its divisors is an integer number (7331820786).

Almost surely, 2^27697989619 is an apocalyptic number.

27697989619 is a deficient number, since it is larger than the sum of its proper divisors (1629293525).

27697989619 is a wasteful number, since it uses less digits than its factorization.

27697989619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629293524.

The product of its digits is 185177664, while the sum is 73.

The spelling of 27697989619 in words is "twenty-seven billion, six hundred ninety-seven million, nine hundred eighty-nine thousand, six hundred nineteen".