28080001 has 2 divisors, whose sum is σ = 28080002. Its totient is φ = 28080000.

The previous prime is 28079999. The next prime is 28080007. The reversal of 28080001 is 10008082.

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., 27878400 + 201601 = 5280^2 + 449^2 .

It is a cyclic number.

It is not a de Polignac number, because 28080001 - 2¹ = 28079999 is a prime.

Together with 28079999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28080007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14040000 + 14040001.

It is an arithmetic number, because the mean of its divisors is an integer number (14040001).

Almost surely, 2^28080001 is an apocalyptic number.

It is an amenable number.

28080001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28080001 is an equidigital number, since it uses as much as digits as its factorization.

28080001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 28080001 is about 5299.0566141531. The cubic root of 28080001 is about 303.9478247542.

Adding to 28080001 its reverse (10008082), we get a palindrome (38088083).

The spelling of 28080001 in words is "twenty-eight million, eighty thousand, one".