28345037318417 has 4 divisors (see below), whose sum is σ = 28345142774820. Its totient is φ = 28344931862016.

The previous prime is 28345037318371. The next prime is 28345037318453. The reversal of 28345037318417 is 71481373054382.

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 24782913323536 + 3562123994881 = 4978244^2 + 1887359^2 .

It is a cyclic number.

It is not a de Polignac number, because 28345037318417 - 2²⁰ = 28345036269841 is a prime.

It is a super-2 number, since 2×28345037318417² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28345037318497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52323992 + ... + 52862937.

It is an arithmetic number, because the mean of its divisors is an integer number (7086285693705).

Almost surely, 2^{28345037318417} is an apocalyptic number.

It is an amenable number.

28345037318417 is a deficient number, since it is larger than the sum of its proper divisors (105456403).

28345037318417 is a wasteful number, since it uses less digits than its factorization.

28345037318417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105456402.

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 28345037318417 in words is "twenty-eight trillion, three hundred forty-five billion, thirty-seven million, three hundred eighteen thousand, four hundred seventeen".