28785128239 has 16 divisors (see below), whose sum is σ = 33608798208. Its totient is φ = 24139697472.

The previous prime is 28785128227. The next prime is 28785128249. The reversal of 28785128239 is 93282158782.

It is a cyclic number.

It is not a de Polignac number, because 28785128239 - 2⁹ = 28785127727 is a prime.

It is a super-2 number, since 2×28785128239² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28785128239.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28785128209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1058122 + ... + 1084984.

It is an arithmetic number, because the mean of its divisors is an integer number (2100549888).

Almost surely, 2^28785128239 is an apocalyptic number.

28785128239 is a deficient number, since it is larger than the sum of its proper divisors (4823669969).

28785128239 is a wasteful number, since it uses less digits than its factorization.

28785128239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30174.

The product of its digits is 3870720, while the sum is 55.

The spelling of 28785128239 in words is "twenty-eight billion, seven hundred eighty-five million, one hundred twenty-eight thousand, two hundred thirty-nine".