27680805 has 16 divisors (see below), whose sum is σ = 49210560. Its totient is φ = 14763024.

The previous prime is 27680803. The next prime is 27680813. The reversal of 27680805 is 50808672.

It is not a de Polignac number, because 27680805 - 2¹ = 27680803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 27680805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27680803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102387 + ... + 102656.

It is an arithmetic number, because the mean of its divisors is an integer number (3075660).

Almost surely, 2^27680805 is an apocalyptic number.

It is an amenable number.

27680805 is a deficient number, since it is larger than the sum of its proper divisors (21529755).

27680805 is a wasteful number, since it uses less digits than its factorization.

27680805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205057 (or 205051 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 27680805 is about 5261.2550784010. The cubic root of 27680805 is about 302.5005987739.

The spelling of 27680805 in words is "twenty-seven million, six hundred eighty thousand, eight hundred five".