28281235836 has 96 divisors (see below), whose sum is σ = 80643935232. Its totient is φ = 7529702400.

The previous prime is 28281235789. The next prime is 28281235859. The reversal of 28281235836 is 63853218282.

It is a super-2 number, since 2×28281235836² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 46185 + ... + 242271.

It is an arithmetic number, because the mean of its divisors is an integer number (840040992).

Almost surely, 2^28281235836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28281235836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40321967616).

28281235836 is an abundant number, since it is smaller than the sum of its proper divisors (52362699396).

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

28281235836 is a wasteful number, since it uses less digits than its factorization.

28281235836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196219 (or 196217 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 48.

The spelling of 28281235836 in words is "twenty-eight billion, two hundred eighty-one million, two hundred thirty-five thousand, eight hundred thirty-six".