28136984856 has 32 divisors (see below), whose sum is σ = 70514473200. Its totient is φ = 9356060160.

The previous prime is 28136984839. The next prime is 28136984861. The reversal of 28136984856 is 65848963182.

It is a self number, because there is not a number n which added to its sum of digits gives 28136984856.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1423405 + ... + 1443036.

Almost surely, 2^28136984856 is an apocalyptic number.

It is an amenable number.

28136984856 is an abundant number, since it is smaller than the sum of its proper divisors (42377488344).

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

28136984856 is a wasteful number, since it uses less digits than its factorization.

28136984856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2866859 (or 2866855 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 60.

The spelling of 28136984856 in words is "twenty-eight billion, one hundred thirty-six million, nine hundred eighty-four thousand, eight hundred fifty-six".