28128716168 has 48 divisors (see below), whose sum is σ = 62848604700. Its totient is φ = 11761128960.

The previous prime is 28128716153. The next prime is 28128716173. The reversal of 28128716168 is 86161782182.

It can be written as a sum of positive squares in 2 ways, for example, as 22637609764 + 5491106404 = 150458^2 + 74102^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 859013 + ... + 891156.

Almost surely, 2^28128716168 is an apocalyptic number.

28128716168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28128716168 is an abundant number, since it is smaller than the sum of its proper divisors (34719888532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28128716168 is a wasteful number, since it uses less digits than its factorization.

28128716168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750230 (or 1750219 counting only the distinct ones).

The product of its digits is 516096, while the sum is 50.

The spelling of 28128716168 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred sixteen thousand, one hundred sixty-eight".