28221635200 has 384 divisors, whose sum is σ = 78680678400. Its totient is φ = 9915494400.

The previous prime is 28221635173. The next prime is 28221635203. The reversal of 28221635200 is 253612282.

It is not an unprimeable number, because it can be changed into a prime (28221635203) 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, 222217537 + ... + 222217663.

It is an arithmetic number, because the mean of its divisors is an integer number (204897600).

Almost surely, 2^28221635200 is an apocalyptic number.

28221635200 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 28221635200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39340339200).

28221635200 is an abundant number, since it is smaller than the sum of its proper divisors (50459043200).

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

28221635200 is a wasteful number, since it uses less digits than its factorization.

28221635200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 28221635200 in words is "twenty-eight billion, two hundred twenty-one million, six hundred thirty-five thousand, two hundred".