28279987200 has 198 divisors, whose sum is σ = 101256558104. Its totient is φ = 7541268480.

The previous prime is 28279987193. The next prime is 28279987283. The reversal of 28279987200 is 278997282.

28279987200 is a `hidden beast` number, since 282 + 79 + 98 + 7 + 200 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 169029 + ... + 291771.

Almost surely, 2^28279987200 is an apocalyptic number.

28279987200 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 28279987200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50628279052).

28279987200 is an abundant number, since it is smaller than the sum of its proper divisors (72976570904).

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

28279987200 is a wasteful number, since it uses less digits than its factorization.

28279987200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122779 (or 122753 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 28279987200 in words is "twenty-eight billion, two hundred seventy-nine million, nine hundred eighty-seven thousand, two hundred".