28557223200 has 864 divisors, whose sum is σ = 116963263872. Its totient is φ = 6488064000.

The previous prime is 28557223153. The next prime is 28557223213. The reversal of 28557223200 is 232275582.

It is a happy number.

28557223200 is a `hidden beast` number, since 2 + 85 + 572 + 2 + 3 + 2 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 111117472 + ... + 111117728.

It is an arithmetic number, because the mean of its divisors is an integer number (135374148).

Almost surely, 2^28557223200 is an apocalyptic number.

28557223200 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 28557223200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58481631936).

28557223200 is an abundant number, since it is smaller than the sum of its proper divisors (88406040672).

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

28557223200 is a wasteful number, since it uses less digits than its factorization.

28557223200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 36.

Adding to 28557223200 its reverse (232275582), we get a palindrome (28789498782).

The spelling of 28557223200 in words is "twenty-eight billion, five hundred fifty-seven million, two hundred twenty-three thousand, two hundred".