27728427 has 8 divisors (see below), whose sum is σ = 37020816. Its totient is φ = 18460832.

The previous prime is 27728417. The next prime is 27728431. The reversal of 27728427 is 72482772.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 27728427 - 2¹¹ = 27726379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (27728417) 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 7 ways as a sum of consecutive naturals, for example, 3408 + ... + 8189.

It is an arithmetic number, because the mean of its divisors is an integer number (4627602).

Almost surely, 2^27728427 is an apocalyptic number.

27728427 is a deficient number, since it is larger than the sum of its proper divisors (9292389).

27728427 is a wasteful number, since it uses less digits than its factorization.

27728427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12397.

The product of its digits is 87808, while the sum is 39.

The square root of 27728427 is about 5265.7788597699. The cubic root of 27728427 is about 302.6739731903.

The spelling of 27728427 in words is "twenty-seven million, seven hundred twenty-eight thousand, four hundred twenty-seven".