27900207809 has 4 divisors (see below), whose sum is σ = 28213693380. Its totient is φ = 27586722240.

The previous prime is 27900207787. The next prime is 27900207823. The reversal of 27900207809 is 90870200972.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17271216400 + 10628991409 = 131420^2 + 103097^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27900207809 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 27900207809.

It is not an unprimeable number, because it can be changed into a prime (27900207869) 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, 156742652 + ... + 156742829.

It is an arithmetic number, because the mean of its divisors is an integer number (7053423345).

Almost surely, 2^27900207809 is an apocalyptic number.

It is an amenable number.

27900207809 is a deficient number, since it is larger than the sum of its proper divisors (313485571).

27900207809 is an equidigital number, since it uses as much as digits as its factorization.

27900207809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313485570.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 27900207809 in words is "twenty-seven billion, nine hundred million, two hundred seven thousand, eight hundred nine".