8285320728 has 216 divisors, whose sum is σ = 24924981900. Its totient is φ = 2479270464.

The previous prime is 8285320727. The next prime is 8285320759. The reversal of 8285320728 is 8270235828.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8285320723) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 77432851 + ... + 77432957.

Almost surely, 2^8285320728 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 8285320728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12462490950).

8285320728 is an abundant number, since it is smaller than the sum of its proper divisors (16639661172).

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

8285320728 is a wasteful number, since it uses less digits than its factorization.

8285320728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 8285320728 is about 91023.7371678399. The cubic root of 8285320728 is about 2023.4995319084.

The spelling of 8285320728 in words is "eight billion, two hundred eighty-five million, three hundred twenty thousand, seven hundred twenty-eight".