28510565 has 8 divisors (see below), whose sum is σ = 34241400. Its totient is φ = 22789312.

The previous prime is 28510523. The next prime is 28510571. The reversal of 28510565 is 56501582.

It can be written as a sum of positive squares in 4 ways, for example, as 12773476 + 15737089 = 3574^2 + 3967^2 .

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 28510565 - 2¹⁰ = 28509541 is a prime.

It is a Curzon number.

It is a congruent number.

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, 9911 + ... + 12459.

It is an arithmetic number, because the mean of its divisors is an integer number (4280175).

Almost surely, 2^28510565 is an apocalyptic number.

It is an amenable number.

28510565 is a deficient number, since it is larger than the sum of its proper divisors (5730835).

28510565 is a wasteful number, since it uses less digits than its factorization.

28510565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4791.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 28510565 is about 5339.5285372400. The cubic root of 28510565 is about 305.4934768774.

The spelling of 28510565 in words is "twenty-eight million, five hundred ten thousand, five hundred sixty-five".