28321075297 has 4 divisors (see below), whose sum is σ = 28439573760. Its totient is φ = 28202576836.

The previous prime is 28321075247. The next prime is 28321075331. The reversal of 28321075297 is 79257012382.

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: 79257012382 = 2 ⋅39628506191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28321075297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28321075247) 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, 59248873 + ... + 59249350.

It is an arithmetic number, because the mean of its divisors is an integer number (7109893440).

Almost surely, 2^28321075297 is an apocalyptic number.

It is an amenable number.

28321075297 is a deficient number, since it is larger than the sum of its proper divisors (118498463).

28321075297 is a wasteful number, since it uses less digits than its factorization.

28321075297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118498462.

The product of its (nonzero) digits is 423360, while the sum is 46.

The spelling of 28321075297 in words is "twenty-eight billion, three hundred twenty-one million, seventy-five thousand, two hundred ninety-seven".