28912165 has 4 divisors (see below), whose sum is σ = 34694604. Its totient is φ = 23129728.

The previous prime is 28912157. The next prime is 28912171. The reversal of 28912165 is 56121982.

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 10439361 + 18472804 = 3231^2 + 4298^2 .

It is a cyclic number.

It is not a de Polignac number, because 28912165 - 2³ = 28912157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28912165.

It is a congruent 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, 2891212 + ... + 2891221.

It is an arithmetic number, because the mean of its divisors is an integer number (8673651).

Almost surely, 2^28912165 is an apocalyptic number.

It is an amenable number.

28912165 is a deficient number, since it is larger than the sum of its proper divisors (5782439).

28912165 is an equidigital number, since it uses as much as digits as its factorization.

28912165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5782438.

The product of its digits is 8640, while the sum is 34.

The square root of 28912165 is about 5377.0033475906. The cubic root of 28912165 is about 306.9211884827.

The spelling of 28912165 in words is "twenty-eight million, nine hundred twelve thousand, one hundred sixty-five".