27875215849 has 4 divisors (see below), whose sum is σ = 30019463236. Its totient is φ = 25730968464.

The previous prime is 27875215847. The next prime is 27875215867. The reversal of 27875215849 is 94851257872.

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 6346990224 + 21528225625 = 79668^2 + 146725^2 .

It is a cyclic number.

It is not a de Polignac number, because 27875215849 - 2¹ = 27875215847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27875215793 and 27875215802.

It is not an unprimeable number, because it can be changed into a prime (27875215847) 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, 1072123674 + ... + 1072123699.

It is an arithmetic number, because the mean of its divisors is an integer number (7504865809).

Almost surely, 2^27875215849 is an apocalyptic number.

It is an amenable number.

27875215849 is a deficient number, since it is larger than the sum of its proper divisors (2144247387).

27875215849 is a wasteful number, since it uses less digits than its factorization.

27875215849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144247386.

The product of its digits is 11289600, while the sum is 58.

The spelling of 27875215849 in words is "twenty-seven billion, eight hundred seventy-five million, two hundred fifteen thousand, eight hundred forty-nine".