27805280803 has 4 divisors (see below), whose sum is σ = 27878646040. Its totient is φ = 27731915568.

The previous prime is 27805280779. The next prime is 27805280809. The reversal of 27805280803 is 30808250872.

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 27805280803 - 2²¹ = 27803183651 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 27805280803.

It is not an unprimeable number, because it can be changed into a prime (27805280809) 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, 36682050 + ... + 36682807.

It is an arithmetic number, because the mean of its divisors is an integer number (6969661510).

Almost surely, 2^27805280803 is an apocalyptic number.

27805280803 is a deficient number, since it is larger than the sum of its proper divisors (73365237).

27805280803 is an equidigital number, since it uses as much as digits as its factorization.

27805280803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73365236.

The product of its (nonzero) digits is 215040, while the sum is 43.

The spelling of 27805280803 in words is "twenty-seven billion, eight hundred five million, two hundred eighty thousand, eight hundred three".