28181850320 has 320 divisors, whose sum is σ = 78894950400. Its totient is φ = 9260697600.

The previous prime is 28181850313. The next prime is 28181850331. The reversal of 28181850320 is 2305818182.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26813795 + ... + 26814845.

It is an arithmetic number, because the mean of its divisors is an integer number (246546720).

Almost surely, 2^28181850320 is an apocalyptic number.

28181850320 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 28181850320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39447475200).

28181850320 is an abundant number, since it is smaller than the sum of its proper divisors (50713100080).

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

28181850320 is a wasteful number, since it uses less digits than its factorization.

28181850320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178 (or 1172 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The spelling of 28181850320 in words is "twenty-eight billion, one hundred eighty-one million, eight hundred fifty thousand, three hundred twenty".