28775500320 has 192 divisors, whose sum is σ = 103751746560. Its totient is φ = 6567103488.

The previous prime is 28775500309. The next prime is 28775500379. The reversal of 28775500320 is 2300557782.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2288611 + ... + 2301149.

It is an arithmetic number, because the mean of its divisors is an integer number (540373680).

Almost surely, 2^28775500320 is an apocalyptic number.

28775500320 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 28775500320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51875873280).

28775500320 is an abundant number, since it is smaller than the sum of its proper divisors (74976246240).

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

28775500320 is a wasteful number, since it uses less digits than its factorization.

28775500320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13247 (or 13239 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 39.

The spelling of 28775500320 in words is "twenty-eight billion, seven hundred seventy-five million, five hundred thousand, three hundred twenty".