28129791781068 has 48 divisors (see below), whose sum is σ = 65682440557440. Its totient is φ = 9369990440064.

The previous prime is 28129791780997. The next prime is 28129791781109. The reversal of 28129791781068 is 86018719792182.

It is a junction number, because it is equal to n+sod(n) for n = 28129791780993 and 28129791781011.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136314855 + ... + 136521057.

It is an arithmetic number, because the mean of its divisors is an integer number (1368384178280).

Almost surely, 2^{28129791781068} is an apocalyptic number.

It is an amenable number.

28129791781068 is an abundant number, since it is smaller than the sum of its proper divisors (37552648776372).

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

28129791781068 is a wasteful number, since it uses less digits than its factorization.

28129791781068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214166 (or 214164 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 69.

The spelling of 28129791781068 in words is "twenty-eight trillion, one hundred twenty-nine billion, seven hundred ninety-one million, seven hundred eighty-one thousand, sixty-eight".