28393639293 has 4 divisors (see below), whose sum is σ = 37858185728. Its totient is φ = 18929092860.

The previous prime is 28393639289. The next prime is 28393639327. The reversal of 28393639293 is 39293639382.

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 not a de Polignac number, because 28393639293 - 2² = 28393639289 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 (28393639223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4732273213 + ... + 4732273218.

It is an arithmetic number, because the mean of its divisors is an integer number (9464546432).

Almost surely, 2^28393639293 is an apocalyptic number.

It is an amenable number.

28393639293 is a deficient number, since it is larger than the sum of its proper divisors (9464546435).

28393639293 is an equidigital number, since it uses as much as digits as its factorization.

28393639293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9464546434.

The product of its digits is 11337408, while the sum is 57.

The spelling of 28393639293 in words is "twenty-eight billion, three hundred ninety-three million, six hundred thirty-nine thousand, two hundred ninety-three".