27128765 has 4 divisors (see below), whose sum is σ = 32554524. Its totient is φ = 21703008.

The previous prime is 27128737. The next prime is 27128767. The reversal of 27128765 is 56782172.

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 8145316 + 18983449 = 2854^2 + 4357^2 .

It is a cyclic number.

It is not a de Polignac number, because 27128765 - 2²⁰ = 26080189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27128767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2712872 + ... + 2712881.

It is an arithmetic number, because the mean of its divisors is an integer number (8138631).

Almost surely, 2^27128765 is an apocalyptic number.

It is an amenable number.

27128765 is a deficient number, since it is larger than the sum of its proper divisors (5425759).

27128765 is an equidigital number, since it uses as much as digits as its factorization.

27128765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425758.

The product of its digits is 47040, while the sum is 38.

The square root of 27128765 is about 5208.5281030249. The cubic root of 27128765 is about 300.4761512741.

The spelling of 27128765 in words is "twenty-seven million, one hundred twenty-eight thousand, seven hundred sixty-five".