27809451238 has 4 divisors (see below), whose sum is σ = 41714176860. Its totient is φ = 13904725618.

The previous prime is 27809451227. The next prime is 27809451269. The reversal of 27809451238 is 83215490872.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 27809451191 and 27809451200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6952362808 + ... + 6952362811.

It is an arithmetic number, because the mean of its divisors is an integer number (10428544215).

Almost surely, 2^27809451238 is an apocalyptic number.

27809451238 is a deficient number, since it is larger than the sum of its proper divisors (13904725622).

27809451238 is a wasteful number, since it uses less digits than its factorization.

27809451238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13904725621.

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 27809451238 in words is "twenty-seven billion, eight hundred nine million, four hundred fifty-one thousand, two hundred thirty-eight".