28281011328 has 160 divisors (see below), whose sum is σ = 86879781120. Its totient is φ = 9122803200.

The previous prime is 28281011327. The next prime is 28281011329. The reversal of 28281011328 is 82311018282.

It is an interprime number because it is at equal distance from previous prime (28281011327) and next prime (28281011329).

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

It is a junction number, because it is equal to n+sod(n) for n = 28281011292 and 28281011301.

It is not an unprimeable number, because it can be changed into a prime (28281011321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 277413 + ... + 365403.

It is an arithmetic number, because the mean of its divisors is an integer number (542998632).

Almost surely, 2^28281011328 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 28281011328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43439890560).

28281011328 is an abundant number, since it is smaller than the sum of its proper divisors (58598769792).

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

28281011328 is an equidigital number, since it uses as much as digits as its factorization.

28281011328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88048 (or 88027 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 28281011328 in words is "twenty-eight billion, two hundred eighty-one million, eleven thousand, three hundred twenty-eight".