27780130405 has 4 divisors (see below), whose sum is σ = 33336156492. Its totient is φ = 22224104320.

The previous prime is 27780130403. The next prime is 27780130439. The reversal of 27780130405 is 50403108772.

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 21316292001 + 6463838404 = 146001^2 + 80398^2 .

It is not a de Polignac number, because 27780130405 - 2¹ = 27780130403 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 (27780130403) 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, 2778013036 + ... + 2778013045.

It is an arithmetic number, because the mean of its divisors is an integer number (8334039123).

Almost surely, 2^27780130405 is an apocalyptic number.

It is an amenable number.

27780130405 is a deficient number, since it is larger than the sum of its proper divisors (5556026087).

27780130405 is an equidigital number, since it uses as much as digits as its factorization.

27780130405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5556026086.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 27780130405 in words is "twenty-seven billion, seven hundred eighty million, one hundred thirty thousand, four hundred five".