28041209856 has 480 divisors, whose sum is σ = 92851799040. Its totient is φ = 8430428160.

The previous prime is 28041209747. The next prime is 28041209857. The reversal of 28041209856 is 65890214082.

It is not an unprimeable number, because it can be changed into a prime (28041209857) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 220796865 + ... + 220796991.

It is an arithmetic number, because the mean of its divisors is an integer number (193441248).

Almost surely, 2^28041209856 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 28041209856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46425899520).

28041209856 is an abundant number, since it is smaller than the sum of its proper divisors (64810589184).

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

28041209856 is an equidigital number, since it uses as much as digits as its factorization.

28041209856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 28041209856 in words is "twenty-eight billion, forty-one million, two hundred nine thousand, eight hundred fifty-six".