521728113672 has 48 divisors (see below), whose sum is σ = 1413528187500. Its totient is φ = 173846042496.

The previous prime is 521728113671. The next prime is 521728113677. The reversal of 521728113672 is 276311827125.

521728113672 is a `hidden beast` number, since 5 + 2 + 1 + 7 + 281 + 1 + 367 + 2 = 666.

521728113672 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 520397760996 + 1330352676 = 721386^2 + 36474^2 .

It is not an unprimeable number, because it can be changed into a prime (521728113671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1120047 + ... + 1515902.

Almost surely, 2^521728113672 is an apocalyptic number.

It is an amenable number.

521728113672 is an abundant number, since it is smaller than the sum of its proper divisors (891800073828).

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

521728113672 is a wasteful number, since it uses less digits than its factorization.

521728113672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638710 (or 2638703 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 521728113672 in words is "five hundred twenty-one billion, seven hundred twenty-eight million, one hundred thirteen thousand, six hundred seventy-two".