28381348800 has 1512 divisors, whose sum is σ = 129528874800. Its totient is φ = 5852528640.

The previous prime is 28381348789. The next prime is 28381348817. The reversal of 28381348800 is 884318382.

It is a super-2 number, since 2×28381348800² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 388785564 + ... + 388785636.

Almost surely, 2^28381348800 is an apocalyptic number.

28381348800 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 28381348800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64764437400).

28381348800 is an abundant number, since it is smaller than the sum of its proper divisors (101147526000).

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

28381348800 is a wasteful number, since it uses less digits than its factorization.

28381348800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The spelling of 28381348800 in words is "twenty-eight billion, three hundred eighty-one million, three hundred forty-eight thousand, eight hundred".