8145729522 has 90 divisors (see below), whose sum is σ = 21253443453. Its totient is φ = 2325053808.

The previous prime is 8145729509. The next prime is 8145729577. The reversal of 8145729522 is 2259275418.

8145729522 is a `hidden beast` number, since 81 + 45 + 7 + 2 + 9 + 522 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4434361281 + 3711368241 = 66591^2 + 60921^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=63819.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8040688 + ... + 8041700.

Almost surely, 2^8145729522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8145729522

8145729522 is an abundant number, since it is smaller than the sum of its proper divisors (13107713931).

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

8145729522 is an equidigital number, since it uses as much as digits as its factorization.

8145729522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2054 (or 1025 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 8145729522 is about 90253.6953370886. The cubic root of 8145729522 is about 2012.0711242375.

The spelling of 8145729522 in words is "eight billion, one hundred forty-five million, seven hundred twenty-nine thousand, five hundred twenty-two".