28425728281 has 4 divisors (see below), whose sum is σ = 28429135632. Its totient is φ = 28422320932.

The previous prime is 28425728197. The next prime is 28425728321. The reversal of 28425728281 is 18282752482.

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.

It is a cyclic number.

It is not a de Polignac number, because 28425728281 - 2¹⁹ = 28425203993 is a prime.

It is a super-2 number, since 2×28425728281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28425726281) 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, 1691131 + ... + 1707856.

It is an arithmetic number, because the mean of its divisors is an integer number (7107283908).

Almost surely, 2^28425728281 is an apocalyptic number.

It is an amenable number.

28425728281 is a deficient number, since it is larger than the sum of its proper divisors (3407351).

28425728281 is an equidigital number, since it uses as much as digits as its factorization.

28425728281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407350.

The product of its digits is 1146880, while the sum is 49.

The spelling of 28425728281 in words is "twenty-eight billion, four hundred twenty-five million, seven hundred twenty-eight thousand, two hundred eighty-one".