28245401 has 4 divisors (see below), whose sum is σ = 28256052. Its totient is φ = 28234752.

The previous prime is 28245397. The next prime is 28245407. The reversal of 28245401 is 10454282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5929225 + 22316176 = 2435^2 + 4724^2 .

It is a cyclic number.

It is not a de Polignac number, because 28245401 - 2² = 28245397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28245407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165 + ... + 7821.

It is an arithmetic number, because the mean of its divisors is an integer number (7064013).

Almost surely, 2^28245401 is an apocalyptic number.

It is an amenable number.

28245401 is a deficient number, since it is larger than the sum of its proper divisors (10651).

28245401 is an equidigital number, since it uses as much as digits as its factorization.

28245401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10650.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 28245401 is about 5314.6402512306. The cubic root of 28245401 is about 304.5434394542.

Adding to 28245401 its reverse (10454282), we get a palindrome (38699683).

The spelling of 28245401 in words is "twenty-eight million, two hundred forty-five thousand, four hundred one".