28302563 has 4 divisors (see below), whose sum is σ = 28594440. Its totient is φ = 28010688.

The previous prime is 28302559. The next prime is 28302577. The reversal of 28302563 is 36520382.

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 28302563 - 2² = 28302559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28302503) 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, 145793 + ... + 145986.

It is an arithmetic number, because the mean of its divisors is an integer number (7148610).

Almost surely, 2^28302563 is an apocalyptic number.

28302563 is a deficient number, since it is larger than the sum of its proper divisors (291877).

28302563 is an equidigital number, since it uses as much as digits as its factorization.

28302563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291876.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 28302563 is about 5320.0153195268. The cubic root of 28302563 is about 304.7487422790.

The spelling of 28302563 in words is "twenty-eight million, three hundred two thousand, five hundred sixty-three".