28317321131905 has 48 divisors (see below), whose sum is σ = 39924594264240. Its totient is φ = 19149254627328.

The previous prime is 28317321131903. The next prime is 28317321131941. The reversal of 28317321131905 is 50913112371382.

It can be written as a sum of positive squares in 24 ways, for example, as 1241158649329 + 27076162482576 = 1114073^2 + 5203476^2 .

It is not a de Polignac number, because 28317321131905 - 2¹ = 28317321131903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28317321131903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19675810 + ... + 21065899.

It is an arithmetic number, because the mean of its divisors is an integer number (831762380505).

Almost surely, 2^{28317321131905} is an apocalyptic number.

It is an amenable number.

28317321131905 is a deficient number, since it is larger than the sum of its proper divisors (11607273132335).

28317321131905 is a wasteful number, since it uses less digits than its factorization.

28317321131905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40741798 (or 40741781 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 28317321131905 in words is "twenty-eight trillion, three hundred seventeen billion, three hundred twenty-one million, one hundred thirty-one thousand, nine hundred five".