28321383533 has 4 divisors (see below), whose sum is σ = 28341148668. Its totient is φ = 28301618400.

The previous prime is 28321383479. The next prime is 28321383553. The reversal of 28321383533 is 33538312382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33538312382 = 2 ⋅16769156191.

It can be written as a sum of positive squares in 2 ways, for example, as 14033245444 + 14288138089 = 118462^2 + 119533^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28321383533 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28321383553) 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, 9880418 + ... + 9883283.

It is an arithmetic number, because the mean of its divisors is an integer number (7085287167).

Almost surely, 2^28321383533 is an apocalyptic number.

It is an amenable number.

28321383533 is a deficient number, since it is larger than the sum of its proper divisors (19765135).

28321383533 is a wasteful number, since it uses less digits than its factorization.

28321383533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19765134.

The product of its digits is 311040, while the sum is 41.

The spelling of 28321383533 in words is "twenty-eight billion, three hundred twenty-one million, three hundred eighty-three thousand, five hundred thirty-three".