28965665 has 4 divisors (see below), whose sum is σ = 34758804. Its totient is φ = 23172528.

The previous prime is 28965661. The next prime is 28965679. The reversal of 28965665 is 56656982.

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 20939776 + 8025889 = 4576^2 + 2833^2 .

It is a cyclic number.

It is not a de Polignac number, because 28965665 - 2² = 28965661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28965661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2896562 + ... + 2896571.

It is an arithmetic number, because the mean of its divisors is an integer number (8689701).

Almost surely, 2^28965665 is an apocalyptic number.

It is an amenable number.

28965665 is a deficient number, since it is larger than the sum of its proper divisors (5793139).

28965665 is an equidigital number, since it uses as much as digits as its factorization.

28965665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793138.

The product of its digits is 777600, while the sum is 47.

The square root of 28965665 is about 5381.9759382591. The cubic root of 28965665 is about 307.1103841123.

The spelling of 28965665 in words is "twenty-eight million, nine hundred sixty-five thousand, six hundred sixty-five".