28320301 has 4 divisors (see below), whose sum is σ = 28350972. Its totient is φ = 28289632.

The previous prime is 28320263. The next prime is 28320307. The reversal of 28320301 is 10302382.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10302382 = 2 ⋅5151191.

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 9916201 = 4290^2 + 3149^2 .

It is a cyclic number.

It is not a de Polignac number, because 28320301 - 2⁹ = 28319789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13906 + ... + 15811.

It is an arithmetic number, because the mean of its divisors is an integer number (7087743).

Almost surely, 2^28320301 is an apocalyptic number.

It is an amenable number.

28320301 is a deficient number, since it is larger than the sum of its proper divisors (30671).

28320301 is an equidigital number, since it uses as much as digits as its factorization.

28320301 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30670.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 28320301 is about 5321.6821588667. The cubic root of 28320301 is about 304.8123938088.

Adding to 28320301 its reverse (10302382), we get a palindrome (38622683).

The spelling of 28320301 in words is "twenty-eight million, three hundred twenty thousand, three hundred one".