28321047613 has 8 divisors (see below), whose sum is σ = 28456583480. Its totient is φ = 28185615360.

The previous prime is 28321047571. The next prime is 28321047641. The reversal of 28321047613 is 31674012382.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5222519289 + 23098528324 = 72267^2 + 151982^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28321047613 - 2²⁵ = 28287493181 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 (28321047413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552781 + ... + 601837.

It is an arithmetic number, because the mean of its divisors is an integer number (3557072935).

Almost surely, 2^28321047613 is an apocalyptic number.

It is an amenable number.

28321047613 is a deficient number, since it is larger than the sum of its proper divisors (135535867).

28321047613 is a wasteful number, since it uses less digits than its factorization.

28321047613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51807.

The product of its (nonzero) digits is 48384, while the sum is 37.

Adding to 28321047613 its reverse (31674012382), we get a palindrome (59995059995).

The spelling of 28321047613 in words is "twenty-eight billion, three hundred twenty-one million, forty-seven thousand, six hundred thirteen".