28909165 has 16 divisors (see below), whose sum is σ = 36748800. Its totient is φ = 21771072.

The previous prime is 28909151. The next prime is 28909171. The reversal of 28909165 is 56190982.

28909165 = 446² + 447² + ... + 559².

It is a cyclic number.

It is not a de Polignac number, because 28909165 - 2¹¹ = 28907117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15556 + ... + 17314.

It is an arithmetic number, because the mean of its divisors is an integer number (2296800).

Almost surely, 2^28909165 is an apocalyptic number.

It is an amenable number.

28909165 is a deficient number, since it is larger than the sum of its proper divisors (7839635).

28909165 is a wasteful number, since it uses less digits than its factorization.

28909165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 28909165 is about 5376.7243745612. The cubic root of 28909165 is about 306.9105724737.

The spelling of 28909165 in words is "twenty-eight million, nine hundred nine thousand, one hundred sixty-five".