8128520520 has 64 divisors (see below), whose sum is σ = 24392862720. Its totient is φ = 2166956544.

The previous prime is 8128520513. The next prime is 8128520531. The reversal of 8128520520 is 250258218.

It is a super-2 number, since 2×8128520520² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498009 + ... + 514071.

It is an arithmetic number, because the mean of its divisors is an integer number (381138480).

Almost surely, 2^8128520520 is an apocalyptic number.

It is an amenable number.

8128520520 is an abundant number, since it is smaller than the sum of its proper divisors (16264342200).

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

8128520520 is a wasteful number, since it uses less digits than its factorization.

8128520520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20294 (or 20290 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 8128520520 is about 90158.3081030251. The cubic root of 8128520520 is about 2010.6531972741.

Adding to 8128520520 its reverse (250258218), we get a palindrome (8378778738).

It can be divided in two parts, 8 and 128520520, that added together give a triangular number (128520528 = T₁₆₀₃₂).

The spelling of 8128520520 in words is "eight billion, one hundred twenty-eight million, five hundred twenty thousand, five hundred twenty".