27680505389 has 4 divisors (see below), whose sum is σ = 27833436540. Its totient is φ = 27527574240.

The previous prime is 27680505373. The next prime is 27680505407. The reversal of 27680505389 is 98350508672.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7421822500 + 20258682889 = 86150^2 + 142333^2 .

It is a cyclic number.

It is not a de Polignac number, because 27680505389 - 2⁴ = 27680505373 is a prime.

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 27680505389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27680505689) 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, 76465304 + ... + 76465665.

It is an arithmetic number, because the mean of its divisors is an integer number (6958359135).

Almost surely, 2^27680505389 is an apocalyptic number.

It is an amenable number.

27680505389 is a deficient number, since it is larger than the sum of its proper divisors (152931151).

27680505389 is a wasteful number, since it uses less digits than its factorization.

27680505389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152931150.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 27680505389 in words is "twenty-seven billion, six hundred eighty million, five hundred five thousand, three hundred eighty-nine".