28728714285 has 20 divisors (see below), whose sum is σ = 51498881148. Its totient is φ = 15321980736.

The previous prime is 28728714283. The next prime is 28728714319. The reversal of 28728714285 is 58241782782.

28728714285 is a `hidden beast` number, since 2 + 87 + 287 + 1 + 4 + 285 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5062891716 + 23665822569 = 71154^2 + 153837^2 .

It is not a de Polignac number, because 28728714285 - 2¹ = 28728714283 is a prime.

It is a super-2 number, since 2×28728714285² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28728714283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35467144 + ... + 35467953.

Almost surely, 2^28728714285 is an apocalyptic number.

It is an amenable number.

28728714285 is a deficient number, since it is larger than the sum of its proper divisors (22770166863).

28728714285 is an equidigital number, since it uses as much as digits as its factorization.

28728714285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70935114 (or 70935105 counting only the distinct ones).

The product of its digits is 4014080, while the sum is 54.

The spelling of 28728714285 in words is "twenty-eight billion, seven hundred twenty-eight million, seven hundred fourteen thousand, two hundred eighty-five".