28569469993 has 4 divisors (see below), whose sum is σ = 28572506820. Its totient is φ = 28566433168.

The previous prime is 28569469991. The next prime is 28569470011. The reversal of 28569469993 is 39996496582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10818704169 + 17750765824 = 104013^2 + 133232^2 .

It is a cyclic number.

It is not a de Polignac number, because 28569469993 - 2¹ = 28569469991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28569469991) 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, 1504258 + ... + 1523131.

It is an arithmetic number, because the mean of its divisors is an integer number (7143126705).

Almost surely, 2^28569469993 is an apocalyptic number.

It is an amenable number.

28569469993 is a deficient number, since it is larger than the sum of its proper divisors (3036827).

28569469993 is an equidigital number, since it uses as much as digits as its factorization.

28569469993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3036826.

The product of its digits is 226748160, while the sum is 70.

The spelling of 28569469993 in words is "twenty-eight billion, five hundred sixty-nine million, four hundred sixty-nine thousand, nine hundred ninety-three".