28303665 has 32 divisors (see below), whose sum is σ = 49109760. Its totient is φ = 13837056.

The previous prime is 28303637. The next prime is 28303669. The reversal of 28303665 is 56630382.

It is not a de Polignac number, because 28303665 - 2¹⁶ = 28238129 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28303669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33316 + ... + 34154.

It is an arithmetic number, because the mean of its divisors is an integer number (1534680).

Almost surely, 2^28303665 is an apocalyptic number.

It is an amenable number.

28303665 is a deficient number, since it is larger than the sum of its proper divisors (20806095).

28303665 is a wasteful number, since it uses less digits than its factorization.

28303665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 28303665 is about 5320.1188896490. The cubic root of 28303665 is about 304.7526975009.

The spelling of 28303665 in words is "twenty-eight million, three hundred three thousand, six hundred sixty-five".