28120845873780 has 384 divisors, whose sum is σ = 101732863680000. Its totient is φ = 6373099560960.

The previous prime is 28120845873751. The next prime is 28120845873793. The reversal of 28120845873780 is 8737854802182.

28120845873780 is a `hidden beast` number, since 2 + 8 + 1 + 208 + 4 + 58 + 7 + 378 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 14111526 + ... + 15980514.

It is an arithmetic number, because the mean of its divisors is an integer number (264929332500).

Almost surely, 2^{28120845873780} is an apocalyptic number.

28120845873780 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 28120845873780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50866431840000).

28120845873780 is an abundant number, since it is smaller than the sum of its proper divisors (73612017806220).

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

28120845873780 is a wasteful number, since it uses less digits than its factorization.

28120845873780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869184 (or 1869176 counting only the distinct ones).

The product of its (nonzero) digits is 48168960, while the sum is 63.

The spelling of 28120845873780 in words is "twenty-eight trillion, one hundred twenty billion, eight hundred forty-five million, eight hundred seventy-three thousand, seven hundred eighty".