28560533 has 4 divisors (see below), whose sum is σ = 28718508. Its totient is φ = 28402560.

The previous prime is 28560491. The next prime is 28560541. The reversal of 28560533 is 33506582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5299204 + 23261329 = 2302^2 + 4823^2 .

It is a cyclic number.

It is not a de Polignac number, because 28560533 - 2¹⁶ = 28494997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28560533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28563533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78716 + ... + 79077.

It is an arithmetic number, because the mean of its divisors is an integer number (7179627).

Almost surely, 2^28560533 is an apocalyptic number.

It is an amenable number.

28560533 is a deficient number, since it is larger than the sum of its proper divisors (157975).

28560533 is a wasteful number, since it uses less digits than its factorization.

28560533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157974.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 28560533 is about 5344.2055536815. The cubic root of 28560533 is about 305.6718433754.

The spelling of 28560533 in words is "twenty-eight million, five hundred sixty thousand, five hundred thirty-three".