27800855309 has 4 divisors (see below), whose sum is σ = 29264058240. Its totient is φ = 26337652380.

The previous prime is 27800855263. The next prime is 27800855311. The reversal of 27800855309 is 90355800872.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 27800855309 - 2⁸ = 27800855053 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 (27800855359) 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, 731601437 + ... + 731601474.

It is an arithmetic number, because the mean of its divisors is an integer number (7316014560).

Almost surely, 2^27800855309 is an apocalyptic number.

It is an amenable number.

27800855309 is a deficient number, since it is larger than the sum of its proper divisors (1463202931).

27800855309 is a wasteful number, since it uses less digits than its factorization.

27800855309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463202930.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 27800855309 in words is "twenty-seven billion, eight hundred million, eight hundred fifty-five thousand, three hundred nine".