28668043609920 has 1120 divisors, whose sum is σ = 123670657668096. Its totient is φ = 6208258867200.

The previous prime is 28668043609853. The next prime is 28668043609943. The reversal of 28668043609920 is 2990634086682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 114778612 + ... + 115028108.

Almost surely, 2^{28668043609920} is an apocalyptic number.

28668043609920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28668043609920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61835328834048).

28668043609920 is an abundant number, since it is smaller than the sum of its proper divisors (95002614058176).

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

28668043609920 is a wasteful number, since it uses less digits than its factorization.

28668043609920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249581 (or 249562 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

The spelling of 28668043609920 in words is "twenty-eight trillion, six hundred sixty-eight billion, forty-three million, six hundred nine thousand, nine hundred twenty".