28285665 has 8 divisors (see below), whose sum is σ = 45257088. Its totient is φ = 15085680.

The previous prime is 28285657. The next prime is 28285667. The reversal of 28285665 is 56658282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28285665 - 2³ = 28285657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28285667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 942841 + ... + 942870.

It is an arithmetic number, because the mean of its divisors is an integer number (5657136).

Almost surely, 2^28285665 is an apocalyptic number.

It is an amenable number.

28285665 is a deficient number, since it is larger than the sum of its proper divisors (16971423).

28285665 is a wasteful number, since it uses less digits than its factorization.

28285665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885719.

The product of its digits is 230400, while the sum is 42.

The square root of 28285665 is about 5318.4269290834. The cubic root of 28285665 is about 304.6880802882.

The spelling of 28285665 in words is "twenty-eight million, two hundred eighty-five thousand, six hundred sixty-five".