28533565 has 8 divisors (see below), whose sum is σ = 36254520. Its totient is φ = 21484032.

The previous prime is 28533509. The next prime is 28533569. The reversal of 28533565 is 56533582.

It can be written as a sum of positive squares in 4 ways, for example, as 2134521 + 26399044 = 1461^2 + 5138^2 .

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 28533565 - 2¹³ = 28525373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28533569) 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, 167760 + ... + 167929.

It is an arithmetic number, because the mean of its divisors is an integer number (4531815).

Almost surely, 2^28533565 is an apocalyptic number.

It is an amenable number.

28533565 is a deficient number, since it is larger than the sum of its proper divisors (7720955).

28533565 is a wasteful number, since it uses less digits than its factorization.

28533565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335711.

The product of its digits is 108000, while the sum is 37.

The square root of 28533565 is about 5341.6818512525. The cubic root of 28533565 is about 305.5756038759.

The spelling of 28533565 in words is "twenty-eight million, five hundred thirty-three thousand, five hundred sixty-five".