28307665 has 8 divisors (see below), whose sum is σ = 34237440. Its totient is φ = 22467312.

The previous prime is 28307651. The next prime is 28307689. The reversal of 28307665 is 56670382.

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

It is a cyclic number.

It is not a de Polignac number, because 28307665 - 2⁵ = 28307633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21655 + ... + 22924.

It is an arithmetic number, because the mean of its divisors is an integer number (4279680).

Almost surely, 2^28307665 is an apocalyptic number.

It is an amenable number.

28307665 is a deficient number, since it is larger than the sum of its proper divisors (5929775).

28307665 is a wasteful number, since it uses less digits than its factorization.

28307665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44711.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 28307665 is about 5320.4948078163. The cubic root of 28307665 is about 304.7670531609.

The spelling of 28307665 in words is "twenty-eight million, three hundred seven thousand, six hundred sixty-five".