28158008128 has 28 divisors (see below), whose sum is σ = 56107928932. Its totient is φ = 14020577280.

The previous prime is 28158008077. The next prime is 28158008159. The reversal of 28158008128 is 82180085182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11390865984 + 16767142144 = 106728^2 + 129488^2 .

It is a congruent number.

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, 897375 + ... + 928222.

Almost surely, 2^28158008128 is an apocalyptic number.

It is an amenable number.

28158008128 is a deficient number, since it is larger than the sum of its proper divisors (27949920804).

28158008128 is a wasteful number, since it uses less digits than its factorization.

28158008128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825850 (or 1825840 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 43.

The spelling of 28158008128 in words is "twenty-eight billion, one hundred fifty-eight million, eight thousand, one hundred twenty-eight".