8123521728 has 112 divisors (see below), whose sum is σ = 25356498944. Its totient is φ = 2246123520.

The previous prime is 8123521711. The next prime is 8123521739. The reversal of 8123521728 is 8271253218.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55825 + ... + 139152.

It is an arithmetic number, because the mean of its divisors is an integer number (226397312).

Almost surely, 2^8123521728 is an apocalyptic number.

It is an amenable number.

8123521728 is an abundant number, since it is smaller than the sum of its proper divisors (17232977216).

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

8123521728 is a wasteful number, since it uses less digits than its factorization.

8123521728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195030 (or 195020 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 8123521728 is about 90130.5815359027. The cubic root of 8123521728 is about 2010.2409493086.

The spelling of 8123521728 in words is "eight billion, one hundred twenty-three million, five hundred twenty-one thousand, seven hundred twenty-eight".