28005138875 has 16 divisors (see below), whose sum is σ = 39943330752. Its totient is φ = 19203523200.

The previous prime is 28005138869. The next prime is 28005138877. The reversal of 28005138875 is 57883150082.

It is not a de Polignac number, because 28005138875 - 2⁸ = 28005138619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28005138877) 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, 16002062 + ... + 16003811.

It is an arithmetic number, because the mean of its divisors is an integer number (2496458172).

Almost surely, 2^28005138875 is an apocalyptic number.

28005138875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28005138875 is a deficient number, since it is larger than the sum of its proper divisors (11938191877).

28005138875 is an equidigital number, since it uses as much as digits as its factorization.

28005138875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32005895 (or 32005885 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 28005138875 in words is "twenty-eight billion, five million, one hundred thirty-eight thousand, eight hundred seventy-five".