28388843738878 has 32 divisors (see below), whose sum is σ = 49800585567744. Its totient is φ = 11883173414112.

The previous prime is 28388843738837. The next prime is 28388843738923. The reversal of 28388843738878 is 87883734888382.

It is a junction number, because it is equal to n+sod(n) for n = 28388843738795 and 28388843738804.

It is a congruent number.

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, 12644176 + ... + 14719132.

It is an arithmetic number, because the mean of its divisors is an integer number (1556268298992).

Almost surely, 2^{28388843738878} is an apocalyptic number.

28388843738878 is a deficient number, since it is larger than the sum of its proper divisors (21411741828866).

28388843738878 is a wasteful number, since it uses less digits than its factorization.

28388843738878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097736.

The product of its digits is 22196256768, while the sum is 85.

The spelling of 28388843738878 in words is "twenty-eight trillion, three hundred eighty-eight billion, eight hundred forty-three million, seven hundred thirty-eight thousand, eight hundred seventy-eight".