28320601 has 4 divisors (see below), whose sum is σ = 28638900. Its totient is φ = 28002304.

The previous prime is 28320599. The next prime is 28320637. The reversal of 28320601 is 10602382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3080025 + 25240576 = 1755^2 + 5024^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320601 - 2¹ = 28320599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28320641) 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 in 3 ways as a sum of consecutive naturals, for example, 159016 + ... + 159193.

It is an arithmetic number, because the mean of its divisors is an integer number (7159725).

Almost surely, 2^28320601 is an apocalyptic number.

It is an amenable number.

28320601 is a deficient number, since it is larger than the sum of its proper divisors (318299).

28320601 is an equidigital number, since it uses as much as digits as its factorization.

28320601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318298.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28320601 is about 5321.7103453683. The cubic root of 28320601 is about 304.8134701085.

Adding to 28320601 its reverse (10602382), we get a palindrome (38922983).

The spelling of 28320601 in words is "twenty-eight million, three hundred twenty thousand, six hundred one".