28112285728 has 24 divisors (see below), whose sum is σ = 55349876988. Its totient is φ = 14055174144.

The previous prime is 28112285711. The next prime is 28112285743. The reversal of 28112285728 is 82758221182.

It can be written as a sum of positive squares in 2 ways, for example, as 25591040784 + 2521244944 = 159972^2 + 50212^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753400 + ... + 789832.

Almost surely, 2^28112285728 is an apocalyptic number.

It is an amenable number.

28112285728 is a deficient number, since it is larger than the sum of its proper divisors (27237591260).

28112285728 is a wasteful number, since it uses less digits than its factorization.

28112285728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60556 (or 60548 counting only the distinct ones).

The product of its digits is 286720, while the sum is 46.

The spelling of 28112285728 in words is "twenty-eight billion, one hundred twelve million, two hundred eighty-five thousand, seven hundred twenty-eight".