28728585874489 has 2 divisors, whose sum is σ = 28728585874490. Its totient is φ = 28728585874488.

The previous prime is 28728585874459. The next prime is 28728585874517. The reversal of 28728585874489 is 98447858582782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28511701933225 + 216883941264 = 5339635^2 + 465708^2 .

It is a cyclic number.

It is not a de Polignac number, because 28728585874489 - 2⁷ = 28728585874361 is a prime.

It is a super-2 number, since 2×28728585874489² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28728585874459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14364292937244 + 14364292937245.

It is an arithmetic number, because the mean of its divisors is an integer number (14364292937245).

Almost surely, 2^{28728585874489} is an apocalyptic number.

It is an amenable number.

28728585874489 is a deficient number, since it is larger than the sum of its proper divisors (1).

28728585874489 is an equidigital number, since it uses as much as digits as its factorization.

28728585874489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23121100800, while the sum is 85.

The spelling of 28728585874489 in words is "twenty-eight trillion, seven hundred twenty-eight billion, five hundred eighty-five million, eight hundred seventy-four thousand, four hundred eighty-nine".