27720065 has 8 divisors (see below), whose sum is σ = 33370920. Its totient is φ = 22104832.

The previous prime is 27720053. The next prime is 27720089. The reversal of 27720065 is 56002772.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2879809 + 24840256 = 1697^2 + 4984^2 .

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 27720065 - 2⁶ = 27720001 is a prime.

It is an unprimeable number.

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, 7160 + ... + 10329.

It is an arithmetic number, because the mean of its divisors is an integer number (4171365).

Almost surely, 2^27720065 is an apocalyptic number.

It is an amenable number.

27720065 is a deficient number, since it is larger than the sum of its proper divisors (5650855).

27720065 is a wasteful number, since it uses less digits than its factorization.

27720065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17811.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 27720065 is about 5264.9848052962. The cubic root of 27720065 is about 302.6435445592.

The spelling of 27720065 in words is "twenty-seven million, seven hundred twenty thousand, sixty-five".