28197120000 has 480 divisors, whose sum is σ = 107459352000. Its totient is φ = 6438912000.

The previous prime is 28197119999. The next prime is 28197120047. The reversal of 28197120000 is 2179182.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 28197120000.

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 39 ways as a sum of consecutive naturals, for example, 26879476 + ... + 26880524.

It is an arithmetic number, because the mean of its divisors is an integer number (223873650).

Almost surely, 2^28197120000 is an apocalyptic number.

28197120000 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 28197120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53729676000).

28197120000 is an abundant number, since it is smaller than the sum of its proper divisors (79262232000).

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

28197120000 is an equidigital number, since it uses as much as digits as its factorization.

28197120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1066 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

Adding to 28197120000 its reverse (2179182), we get a palindrome (28199299182).

The spelling of 28197120000 in words is "twenty-eight billion, one hundred ninety-seven million, one hundred twenty thousand".