28109820189696 has 704 divisors, whose sum is σ = 94329382109184. Its totient is φ = 7257135513600.

The previous prime is 28109820189641. The next prime is 28109820189701. The reversal of 28109820189696 is 69698102890182.

It is a self number, because there is not a number n which added to its sum of digits gives 28109820189696.

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 63 ways as a sum of consecutive naturals, for example, 1439231451 + ... + 1439250981.

Almost surely, 2^{28109820189696} 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 28109820189696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47164691054592).

28109820189696 is an abundant number, since it is smaller than the sum of its proper divisors (66219561919488).

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

28109820189696 is a wasteful number, since it uses less digits than its factorization.

28109820189696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19736 (or 19718 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 69.

The spelling of 28109820189696 in words is "twenty-eight trillion, one hundred nine billion, eight hundred twenty million, one hundred eighty-nine thousand, six hundred ninety-six".