28320001 has 2 divisors, whose sum is σ = 28320002. Its totient is φ = 28320000.

The previous prime is 28319981. The next prime is 28320007. The reversal of 28320001 is 10002382.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19793601 + 8526400 = 4449^2 + 2920^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320001 - 2⁷ = 28319873 is a prime.

It is not a weakly prime, because it can be changed into another prime (28320007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160000 + 14160001.

It is an arithmetic number, because the mean of its divisors is an integer number (14160001).

Almost surely, 2^28320001 is an apocalyptic number.

It is an amenable number.

28320001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28320001 is an equidigital number, since it uses as much as digits as its factorization.

28320001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 28320001 is about 5321.6539722158. The cubic root of 28320001 is about 304.8113175015.

Adding to 28320001 its reverse (10002382), we get a palindrome (38322383).

The spelling of 28320001 in words is "twenty-eight million, three hundred twenty thousand, one".