28567321 has 2 divisors, whose sum is σ = 28567322. Its totient is φ = 28567320.

The previous prime is 28567307. The next prime is 28567381. The reversal of 28567321 is 12376582.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28249225 + 318096 = 5315^2 + 564^2 .

It is a cyclic number.

It is not a de Polignac number, because 28567321 - 2⁷ = 28567193 is a prime.

It is not a weakly prime, because it can be changed into another prime (28567381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14283660 + 14283661.

It is an arithmetic number, because the mean of its divisors is an integer number (14283661).

Almost surely, 2^28567321 is an apocalyptic number.

It is an amenable number.

28567321 is a deficient number, since it is larger than the sum of its proper divisors (1).

28567321 is an equidigital number, since it uses as much as digits as its factorization.

28567321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 34.

The square root of 28567321 is about 5344.8405963134. The cubic root of 28567321 is about 305.6960578641.

The spelling of 28567321 in words is "twenty-eight million, five hundred sixty-seven thousand, three hundred twenty-one".