28081207850105 has 8 divisors (see below), whose sum is σ = 33731248272072. Its totient is φ = 22442433712128.

The previous prime is 28081207850057. The next prime is 28081207850107. The reversal of 28081207850105 is 50105870218082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15269361205609 + 12811846644496 = 3907603^2 + 3579364^2 .

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 28081207850105 - 2⁴⁰ = 26981696222329 is a prime.

It is a super-2 number, since 2×28081207850105² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28081207850105.

It is not an unprimeable number, because it can be changed into a prime (28081207850107) 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, 2816565512 + ... + 2816575481.

It is an arithmetic number, because the mean of its divisors is an integer number (4216406034009).

Almost surely, 2^{28081207850105} is an apocalyptic number.

It is an amenable number.

28081207850105 is a deficient number, since it is larger than the sum of its proper divisors (5650040421967).

28081207850105 is an equidigital number, since it uses as much as digits as its factorization.

28081207850105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633141995.

The product of its (nonzero) digits is 358400, while the sum is 47.

The spelling of 28081207850105 in words is "twenty-eight trillion, eighty-one billion, two hundred seven million, eight hundred fifty thousand, one hundred five".