28081320192 has 144 divisors (see below), whose sum is σ = 84212472960. Its totient is φ = 9228441600.

The previous prime is 28081320077. The next prime is 28081320203. The reversal of 28081320192 is 29102318082.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 462142 + ... + 519362.

It is an arithmetic number, because the mean of its divisors is an integer number (584808840).

Almost surely, 2^28081320192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28081320192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42106236480).

28081320192 is an abundant number, since it is smaller than the sum of its proper divisors (56131152768).

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

28081320192 is an equidigital number, since it uses as much as digits as its factorization.

28081320192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57317 (or 57297 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 28081320192 in words is "twenty-eight billion, eighty-one million, three hundred twenty thousand, one hundred ninety-two".