28308563 has 2 divisors, whose sum is σ = 28308564. Its totient is φ = 28308562.

The previous prime is 28308559. The next prime is 28308571. The reversal of 28308563 is 36580382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28308563 - 2² = 28308559 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28308503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14154281 + 14154282.

It is an arithmetic number, because the mean of its divisors is an integer number (14154282).

Almost surely, 2^28308563 is an apocalyptic number.

28308563 is a deficient number, since it is larger than the sum of its proper divisors (1).

28308563 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 28308563 = (58236038)₉.

28308563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 28308563 is about 5320.5791977942. The cubic root of 28308563 is about 304.7702758206.

The spelling of 28308563 in words is "twenty-eight million, three hundred eight thousand, five hundred sixty-three".