8220138528 has 96 divisors (see below), whose sum is σ = 24769511424. Its totient is φ = 2338221312.

The previous prime is 8220138527. The next prime is 8220138551. The reversal of 8220138528 is 8258310228.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is not an unprimeable number, because it can be changed into a prime (8220138527) by changing a digit.

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, 125601 + ... + 179487.

It is an arithmetic number, because the mean of its divisors is an integer number (258015744).

Almost surely, 2^8220138528 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 8220138528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12384755712).

8220138528 is an abundant number, since it is smaller than the sum of its proper divisors (16549372896).

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

8220138528 is a wasteful number, since it uses less digits than its factorization.

8220138528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54134 (or 54126 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 39.

The square root of 8220138528 is about 90664.9796117553. The cubic root of 8220138528 is about 2018.1791361823.

The spelling of 8220138528 in words is "eight billion, two hundred twenty million, one hundred thirty-eight thousand, five hundred twenty-eight".