28381086720 has 704 divisors, whose sum is σ = 116649523200. Its totient is φ = 6409912320.

The previous prime is 28381086641. The next prime is 28381086751. The reversal of 28381086720 is 2768018382.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 134507415 + ... + 134507625.

Almost surely, 2^28381086720 is an apocalyptic number.

28381086720 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 28381086720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58324761600).

28381086720 is an abundant number, since it is smaller than the sum of its proper divisors (88268436480).

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

28381086720 is a wasteful number, since it uses less digits than its factorization.

28381086720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 28381086720 in words is "twenty-eight billion, three hundred eighty-one million, eighty-six thousand, seven hundred twenty".