28668781579 has 16 divisors (see below), whose sum is σ = 30329740800. Its totient is φ = 27023232096.

The previous prime is 28668781513. The next prime is 28668781597. The reversal of 28668781579 is 97518786682.

It is a cyclic number.

It is not a de Polignac number, because 28668781579 - 2¹³ = 28668773387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28668781279) 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 15 ways as a sum of consecutive naturals, for example, 7867732 + ... + 7871374.

It is an arithmetic number, because the mean of its divisors is an integer number (1895608800).

Almost surely, 2^28668781579 is an apocalyptic number.

28668781579 is a deficient number, since it is larger than the sum of its proper divisors (1660959221).

28668781579 is a wasteful number, since it uses less digits than its factorization.

28668781579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5634.

The product of its digits is 81285120, while the sum is 67.

The spelling of 28668781579 in words is "twenty-eight billion, six hundred sixty-eight million, seven hundred eighty-one thousand, five hundred seventy-nine".