28941728080 has 80 divisors (see below), whose sum is σ = 67997880000. Its totient is φ = 11455082496.

The previous prime is 28941728071. The next prime is 28941728089. The reversal of 28941728080 is 8082714982.

It is an interprime number because it is at equal distance from previous prime (28941728071) and next prime (28941728089).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28941728089) 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 15 ways as a sum of consecutive naturals, for example, 10690087 + ... + 10692793.

It is an arithmetic number, because the mean of its divisors is an integer number (849973500).

Almost surely, 2^28941728080 is an apocalyptic number.

28941728080 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 28941728080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33998940000).

28941728080 is an abundant number, since it is smaller than the sum of its proper divisors (39056151920).

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

28941728080 is a wasteful number, since it uses less digits than its factorization.

28941728080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4076 (or 4070 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 28941728080 in words is "twenty-eight billion, nine hundred forty-one million, seven hundred twenty-eight thousand, eighty".