28256849310605 has 18 divisors (see below), whose sum is σ = 35787076896366. Its totient is φ = 21415546209456.

The previous prime is 28256849310601. The next prime is 28256849310673. The reversal of 28256849310605 is 50601394865282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 22605479448484 + 5651369862121 = 4754522^2 + 2377261^2 .

It is not a de Polignac number, because 28256849310605 - 2² = 28256849310601 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 (28256849310601) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 225777236 + ... + 225902354.

It is an arithmetic number, because the mean of its divisors is an integer number (1988170938687).

Almost surely, 2^{28256849310605} is an apocalyptic number.

It is an amenable number.

28256849310605 is a deficient number, since it is larger than the sum of its proper divisors (7530227585761).

28256849310605 is an frugal number, since it uses more digits than its factorization.

28256849310605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250281 (or 125143 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 59.

The spelling of 28256849310605 in words is "twenty-eight trillion, two hundred fifty-six billion, eight hundred forty-nine million, three hundred ten thousand, six hundred five".