27889680487 has 4 divisors (see below), whose sum is σ = 27890985160. Its totient is φ = 27888375816.

The previous prime is 27889680473. The next prime is 27889680517. The reversal of 27889680487 is 78408698872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27889680487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27889680407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 619728 + ... + 663205.

It is an arithmetic number, because the mean of its divisors is an integer number (6972746290).

Almost surely, 2^27889680487 is an apocalyptic number.

27889680487 is a deficient number, since it is larger than the sum of its proper divisors (1304673).

27889680487 is a wasteful number, since it uses less digits than its factorization.

27889680487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304672.

The product of its (nonzero) digits is 86704128, while the sum is 67.

The spelling of 27889680487 in words is "twenty-seven billion, eight hundred eighty-nine million, six hundred eighty thousand, four hundred eighty-seven".