28216354517 has 4 divisors (see below), whose sum is σ = 30386843340. Its totient is φ = 26045865696.

The previous prime is 28216354501. The next prime is 28216354519. The reversal of 28216354517 is 71545361282.

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 15295258276 + 12921096241 = 123674^2 + 113671^2 .

It is a cyclic number.

It is not a de Polignac number, because 28216354517 - 2⁴ = 28216354501 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 (28216354519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085244392 + ... + 1085244417.

It is an arithmetic number, because the mean of its divisors is an integer number (7596710835).

Almost surely, 2^28216354517 is an apocalyptic number.

It is an amenable number.

28216354517 is a deficient number, since it is larger than the sum of its proper divisors (2170488823).

28216354517 is a wasteful number, since it uses less digits than its factorization.

28216354517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170488822.

The product of its digits is 403200, while the sum is 44.

The spelling of 28216354517 in words is "twenty-eight billion, two hundred sixteen million, three hundred fifty-four thousand, five hundred seventeen".