28731782280 has 192 divisors, whose sum is σ = 92163951360. Its totient is φ = 7140818944.

The previous prime is 28731782251. The next prime is 28731782291. The reversal of 28731782280 is 8228713782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26048209 + ... + 26049311.

It is an arithmetic number, because the mean of its divisors is an integer number (480020580).

Almost surely, 2^28731782280 is an apocalyptic number.

28731782280 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 28731782280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46081975680).

28731782280 is an abundant number, since it is smaller than the sum of its proper divisors (63432169080).

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

28731782280 is a wasteful number, since it uses less digits than its factorization.

28731782280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1360 (or 1243 counting only the distinct ones).

The product of its (nonzero) digits is 602112, while the sum is 48.

The spelling of 28731782280 in words is "twenty-eight billion, seven hundred thirty-one million, seven hundred eighty-two thousand, two hundred eighty".