28180354266 has 192 divisors, whose sum is σ = 69872025600. Its totient is φ = 8160768000.

The previous prime is 28180354261. The next prime is 28180354277. The reversal of 28180354266 is 66245308182.

28180354266 is a `hidden beast` number, since 28 + 1 + 80 + 3 + 542 + 6 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28180354261) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 24482791 + ... + 24483941.

It is an arithmetic number, because the mean of its divisors is an integer number (363916800).

Almost surely, 2^28180354266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28180354266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34936012800).

28180354266 is an abundant number, since it is smaller than the sum of its proper divisors (41691671334).

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

28180354266 is a wasteful number, since it uses less digits than its factorization.

28180354266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 28180354266 in words is "twenty-eight billion, one hundred eighty million, three hundred fifty-four thousand, two hundred sixty-six".