28585765 has 8 divisors (see below), whose sum is σ = 36941688. Its totient is φ = 21109440.

The previous prime is 28585741. The next prime is 28585769. The reversal of 28585765 is 56758582.

It can be written as a sum of positive squares in 4 ways, for example, as 1887876 + 26697889 = 1374^2 + 5167^2 .

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

It is not a de Polignac number, because 28585765 - 2¹¹ = 28583717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28585769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219826 + ... + 219955.

It is an arithmetic number, because the mean of its divisors is an integer number (4617711).

Almost surely, 2^28585765 is an apocalyptic number.

It is an amenable number.

28585765 is a deficient number, since it is larger than the sum of its proper divisors (8355923).

28585765 is a wasteful number, since it uses less digits than its factorization.

28585765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439799.

The product of its digits is 672000, while the sum is 46.

The square root of 28585765 is about 5346.5657201609. The cubic root of 28585765 is about 305.7618328465.

The spelling of 28585765 in words is "twenty-eight million, five hundred eighty-five thousand, seven hundred sixty-five".