28806436105 has 8 divisors (see below), whose sum is σ = 34570552392. Its totient is φ = 23043262848.

The previous prime is 28806436073. The next prime is 28806436133. The reversal of 28806436105 is 50163460882.

It can be written as a sum of positive squares in 4 ways, for example, as 11617390656 + 17189045449 = 107784^2 + 131107^2 .

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 28806436105 - 2⁵ = 28806436073 is a prime.

It is a super-2 number, since 2×28806436105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166714 + ... + 292243.

It is an arithmetic number, because the mean of its divisors is an integer number (4321319049).

Almost surely, 2^28806436105 is an apocalyptic number.

It is an amenable number.

28806436105 is a deficient number, since it is larger than the sum of its proper divisors (5764116287).

28806436105 is a wasteful number, since it uses less digits than its factorization.

28806436105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471515.

The product of its (nonzero) digits is 276480, while the sum is 43.

Adding to 28806436105 its reverse (50163460882), we get a palindrome (78969896987).

The spelling of 28806436105 in words is "twenty-eight billion, eight hundred six million, four hundred thirty-six thousand, one hundred five".