27680408671 has 4 divisors (see below), whose sum is σ = 28149568200. Its totient is φ = 27211249144.

The previous prime is 27680408653. The next prime is 27680408677. The reversal of 27680408671 is 17680408672.

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 27680408671 - 2²⁵ = 27646854239 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 (27680408677) 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, 234579676 + ... + 234579793.

It is an arithmetic number, because the mean of its divisors is an integer number (7037392050).

Almost surely, 2^27680408671 is an apocalyptic number.

27680408671 is a deficient number, since it is larger than the sum of its proper divisors (469159529).

27680408671 is an equidigital number, since it uses as much as digits as its factorization.

27680408671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469159528.

The product of its (nonzero) digits is 903168, while the sum is 49.

Subtracting from 27680408671 its reverse (17680408672), we obtain a palindrome (9999999999).

The spelling of 27680408671 in words is "twenty-seven billion, six hundred eighty million, four hundred eight thousand, six hundred seventy-one".