28338734878 has 48 divisors (see below), whose sum is σ = 47313192960. Its totient is φ = 12687781680.

The previous prime is 28338734873. The next prime is 28338734887. The reversal of 28338734878 is 87843783382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28338734873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1561251 + ... + 1579297.

It is an arithmetic number, because the mean of its divisors is an integer number (985691520).

Almost surely, 2^28338734878 is an apocalyptic number.

28338734878 is a deficient number, since it is larger than the sum of its proper divisors (18974458082).

28338734878 is a wasteful number, since it uses less digits than its factorization.

28338734878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18173 (or 18142 counting only the distinct ones).

The product of its digits is 43352064, while the sum is 61.

The spelling of 28338734878 in words is "twenty-eight billion, three hundred thirty-eight million, seven hundred thirty-four thousand, eight hundred seventy-eight".