28128994688 has 16 divisors (see below), whose sum is σ = 56038231860. Its totient is φ = 14064497280.

The previous prime is 28128994679. The next prime is 28128994693. The reversal of 28128994688 is 88649982182.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109878758 + ... + 109879013.

Almost surely, 2^28128994688 is an apocalyptic number.

It is an amenable number.

28128994688 is a deficient number, since it is larger than the sum of its proper divisors (27909237172).

28128994688 is an equidigital number, since it uses as much as digits as its factorization.

28128994688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219757785 (or 219757773 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 65.

The spelling of 28128994688 in words is "twenty-eight billion, one hundred twenty-eight million, nine hundred ninety-four thousand, six hundred eighty-eight".