28563505 has 8 divisors (see below), whose sum is σ = 34313472. Its totient is φ = 22825968.

The previous prime is 28563503. The next prime is 28563523. The reversal of 28563505 is 50536582.

It is a happy number.

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 28563505 - 2¹ = 28563503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28563503) 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, 3072 + ... + 8158.

It is an arithmetic number, because the mean of its divisors is an integer number (4289184).

Almost surely, 2^28563505 is an apocalyptic number.

It is an amenable number.

28563505 is a deficient number, since it is larger than the sum of its proper divisors (5749967).

28563505 is a wasteful number, since it uses less digits than its factorization.

28563505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6215.

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 28563505 is about 5344.4836046151. The cubic root of 28563505 is about 305.6824457126.

The spelling of 28563505 in words is "twenty-eight million, five hundred sixty-three thousand, five hundred five".