27943870109 has 4 divisors (see below), whose sum is σ = 28063801116. Its totient is φ = 27823939104.

The previous prime is 27943870099. The next prime is 27943870111. The reversal of 27943870109 is 90107834972.

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 2318904025 + 25624966084 = 48155^2 + 160078^2 .

It is a cyclic number.

It is not a de Polignac number, because 27943870109 - 2²⁸ = 27675434653 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 (27943870709) 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, 59965154 + ... + 59965619.

It is an arithmetic number, because the mean of its divisors is an integer number (7015950279).

Almost surely, 2^27943870109 is an apocalyptic number.

It is an amenable number.

27943870109 is a deficient number, since it is larger than the sum of its proper divisors (119931007).

27943870109 is a wasteful number, since it uses less digits than its factorization.

27943870109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119931006.

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 27943870109 in words is "twenty-seven billion, nine hundred forty-three million, eight hundred seventy thousand, one hundred nine".