28128301 has 4 divisors (see below), whose sum is σ = 28141504. Its totient is φ = 28115100.

The previous prime is 28128271. The next prime is 28128307. The reversal of 28128301 is 10382182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10382182 = 2 ⋅5191091.

It is a cyclic number.

It is not a de Polignac number, because 28128301 - 2¹³ = 28120109 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 (28128307) 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 in 3 ways as a sum of consecutive naturals, for example, 2595 + ... + 7936.

It is an arithmetic number, because the mean of its divisors is an integer number (7035376).

Almost surely, 2^28128301 is an apocalyptic number.

It is an amenable number.

28128301 is a deficient number, since it is larger than the sum of its proper divisors (13203).

28128301 is a wasteful number, since it uses less digits than its factorization.

28128301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13202.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28128301 is about 5303.6120710323. The cubic root of 28128301 is about 304.1219970014.

It can be divided in two parts, 281 and 28301, that added together give a palindrome (28582).

The spelling of 28128301 in words is "twenty-eight million, one hundred twenty-eight thousand, three hundred one".