28863521 has 2 divisors, whose sum is σ = 28863522. Its totient is φ = 28863520.

The previous prime is 28863517. The next prime is 28863529. The reversal of 28863521 is 12536882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28472896 + 390625 = 5336^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 28863521 - 2² = 28863517 is a prime.

It is a Chen prime.

It is equal to p_1791755 and since 28863521 and 1791755 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28863529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14431760 + 14431761.

It is an arithmetic number, because the mean of its divisors is an integer number (14431761).

Almost surely, 2^28863521 is an apocalyptic number.

It is an amenable number.

28863521 is a deficient number, since it is larger than the sum of its proper divisors (1).

28863521 is an equidigital number, since it uses as much as digits as its factorization.

28863521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 35.

The square root of 28863521 is about 5372.4781060512. The cubic root of 28863521 is about 306.7489627642.

The spelling of 28863521 in words is "twenty-eight million, eight hundred sixty-three thousand, five hundred twenty-one".