28309883280 has 240 divisors, whose sum is σ = 102610396800. Its totient is φ = 6437781504.

The previous prime is 28309883279. The next prime is 28309883281. The reversal of 28309883280 is 8238890382.

It is an interprime number because it is at equal distance from previous prime (28309883279) and next prime (28309883281).

It is a tau number, because it is divible by the number of its divisors (240).

It is not an unprimeable number, because it can be changed into a prime (28309883281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2334192 + ... + 2346288.

It is an arithmetic number, because the mean of its divisors is an integer number (427543320).

Almost surely, 2^28309883280 is an apocalyptic number.

28309883280 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 28309883280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51305198400).

28309883280 is an abundant number, since it is smaller than the sum of its proper divisors (74300513520).

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

28309883280 is a wasteful number, since it uses less digits than its factorization.

28309883280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12326 (or 12313 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The spelling of 28309883280 in words is "twenty-eight billion, three hundred nine million, eight hundred eighty-three thousand, two hundred eighty".