28133506878 has 16 divisors (see below), whose sum is σ = 56277878160. Its totient is φ = 9376024896.

The previous prime is 28133506847. The next prime is 28133506879. The reversal of 28133506878 is 87860533182.

It is a super-3 number, since 3×28133506878³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28133506878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28133506879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418825 + ... + 481332.

It is an arithmetic number, because the mean of its divisors is an integer number (3517367385).

Almost surely, 2^28133506878 is an apocalyptic number.

28133506878 is an abundant number, since it is smaller than the sum of its proper divisors (28144371282).

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

28133506878 is a wasteful number, since it uses less digits than its factorization.

28133506878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905371.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 28133506878 in words is "twenty-eight billion, one hundred thirty-three million, five hundred six thousand, eight hundred seventy-eight".