27121638 has 8 divisors (see below), whose sum is σ = 54243288. Its totient is φ = 9040544.

The previous prime is 27121609. The next prime is 27121639. The reversal of 27121638 is 83612172.

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

27121638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27121639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2260131 + ... + 2260142.

It is an arithmetic number, because the mean of its divisors is an integer number (6780411).

Almost surely, 2^27121638 is an apocalyptic number.

27121638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27121638 is a wasteful number, since it uses less digits than its factorization.

27121638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520278.

The product of its digits is 4032, while the sum is 30.

The square root of 27121638 is about 5207.8438916696. The cubic root of 27121638 is about 300.4498362651.

The spelling of 27121638 in words is "twenty-seven million, one hundred twenty-one thousand, six hundred thirty-eight".