32728565 has 4 divisors (see below), whose sum is σ = 39274284. Its totient is φ = 26182848.

The previous prime is 32728561. The next prime is 32728567. The reversal of 32728565 is 56582723.

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 22061809 + 10666756 = 4697^2 + 3266^2 .

It is a cyclic number.

It is not a de Polignac number, because 32728565 - 2² = 32728561 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 (32728561) 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, 3272852 + ... + 3272861.

It is an arithmetic number, because the mean of its divisors is an integer number (9818571).

Almost surely, 2^32728565 is an apocalyptic number.

It is an amenable number.

32728565 is a deficient number, since it is larger than the sum of its proper divisors (6545719).

32728565 is an equidigital number, since it uses as much as digits as its factorization.

32728565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6545718.

The product of its digits is 100800, while the sum is 38.

The square root of 32728565 is about 5720.8884799478. Note that the first 3 decimals coincide. The cubic root of 32728565 is about 319.8715793292.

The spelling of 32728565 in words is "thirty-two million, seven hundred twenty-eight thousand, five hundred sixty-five".