27809638 has 8 divisors (see below), whose sum is σ = 41738040. Its totient is φ = 13896960.

The previous prime is 27809633. The next prime is 27809641. The reversal of 27809638 is 83690872.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 27809594 and 27809603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27809633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2793 + ... + 7963.

It is an arithmetic number, because the mean of its divisors is an integer number (5217255).

Almost surely, 2^27809638 is an apocalyptic number.

27809638 is a deficient number, since it is larger than the sum of its proper divisors (13928402).

27809638 is a wasteful number, since it uses less digits than its factorization.

27809638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7862.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 27809638 is about 5273.4844268282. The cubic root of 27809638 is about 302.9691756304.

The spelling of 27809638 in words is "twenty-seven million, eight hundred nine thousand, six hundred thirty-eight".