28817563 has 4 divisors (see below), whose sum is σ = 28886760. Its totient is φ = 28748368.

The previous prime is 28817557. The next prime is 28817573. The reversal of 28817563 is 36571882.

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 28817563 - 2¹³ = 28809371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28817573) 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, 33970 + ... + 34807.

It is an arithmetic number, because the mean of its divisors is an integer number (7221690).

Almost surely, 2^28817563 is an apocalyptic number.

28817563 is a deficient number, since it is larger than the sum of its proper divisors (69197).

28817563 is an equidigital number, since it uses as much as digits as its factorization.

28817563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69196.

The product of its digits is 80640, while the sum is 40.

The square root of 28817563 is about 5368.1992325174. The cubic root of 28817563 is about 306.5860690577.

The spelling of 28817563 in words is "twenty-eight million, eight hundred seventeen thousand, five hundred sixty-three".