28181580000 has 480 divisors, whose sum is σ = 111889983744. Its totient is φ = 6061056000.

The previous prime is 28181579981. The next prime is 28181580013. The reversal of 28181580000 is 8518182.

It is a tau number, because it is divible by the number of its divisors (480).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7138027 + ... + 7141973.

Almost surely, 2^28181580000 is an apocalyptic number.

28181580000 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 28181580000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55944991872).

28181580000 is an abundant number, since it is smaller than the sum of its proper divisors (83708403744).

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

28181580000 is a wasteful number, since it uses less digits than its factorization.

28181580000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004 (or 3981 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The spelling of 28181580000 in words is "twenty-eight billion, one hundred eighty-one million, five hundred eighty thousand".