28001208980105 has 4 divisors (see below), whose sum is σ = 33601450776132. Its totient is φ = 22400967184080.

The previous prime is 28001208980099. The next prime is 28001208980131. The reversal of 28001208980105 is 50108980210082.

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 9318317918464 + 18682891061641 = 3052592^2 + 4322371^2 .

It is not a de Polignac number, because 28001208980105 - 2²⁴ = 28001192202889 is a prime.

It is a super-2 number, since 2×28001208980105² (a number of 28 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 3 ways as a sum of consecutive naturals, for example, 2800120898006 + ... + 2800120898015.

It is an arithmetic number, because the mean of its divisors is an integer number (8400362694033).

Almost surely, 2^{28001208980105} is an apocalyptic number.

It is an amenable number.

28001208980105 is a deficient number, since it is larger than the sum of its proper divisors (5600241796027).

28001208980105 is an equidigital number, since it uses as much as digits as its factorization.

28001208980105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600241796026.

The product of its (nonzero) digits is 92160, while the sum is 44.

The spelling of 28001208980105 in words is "twenty-eight trillion, one billion, two hundred eight million, nine hundred eighty thousand, one hundred five".