27128065 has 4 divisors (see below), whose sum is σ = 32553684. Its totient is φ = 21702448.

The previous prime is 27128033. The next prime is 27128083. The reversal of 27128065 is 56082172.

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 16785409 + 10342656 = 4097^2 + 3216^2 .

It is a cyclic number.

It is not a de Polignac number, because 27128065 - 2⁵ = 27128033 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2712802 + ... + 2712811.

It is an arithmetic number, because the mean of its divisors is an integer number (8138421).

Almost surely, 2^27128065 is an apocalyptic number.

It is an amenable number.

27128065 is a deficient number, since it is larger than the sum of its proper divisors (5425619).

27128065 is an equidigital number, since it uses as much as digits as its factorization.

27128065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425618.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 27128065 is about 5208.4609051043. The cubic root of 27128065 is about 300.4735668695.

The spelling of 27128065 in words is "twenty-seven million, one hundred twenty-eight thousand, sixty-five".