28728165 has 16 divisors (see below), whose sum is σ = 47448576. Its totient is φ = 14827200.

The previous prime is 28728163. The next prime is 28728191. The reversal of 28728165 is 56182782.

It is not a de Polignac number, because 28728165 - 2¹ = 28728163 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30426 + ... + 31355.

It is an arithmetic number, because the mean of its divisors is an integer number (2965536).

Almost surely, 2^28728165 is an apocalyptic number.

It is an amenable number.

28728165 is a deficient number, since it is larger than the sum of its proper divisors (18720411).

28728165 is a wasteful number, since it uses less digits than its factorization.

28728165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61820.

The product of its digits is 53760, while the sum is 39.

The square root of 28728165 is about 5359.8661363881. The cubic root of 28728165 is about 306.2687096719.

The spelling of 28728165 in words is "twenty-eight million, seven hundred twenty-eight thousand, one hundred sixty-five".