28505063 has 4 divisors (see below), whose sum is σ = 28675920. Its totient is φ = 28334208.

The previous prime is 28505053. The next prime is 28505093. The reversal of 28505063 is 36050582.

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

It is a cyclic number.

It is not a de Polignac number, because 28505063 - 2¹⁰ = 28504039 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 (28505003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85178 + ... + 85511.

It is an arithmetic number, because the mean of its divisors is an integer number (7168980).

Almost surely, 2^28505063 is an apocalyptic number.

28505063 is a deficient number, since it is larger than the sum of its proper divisors (170857).

28505063 is a wasteful number, since it uses less digits than its factorization.

28505063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170856.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 28505063 is about 5339.0132983539. The cubic root of 28505063 is about 305.4738241247.

The spelling of 28505063 in words is "twenty-eight million, five hundred five thousand, sixty-three".