5721321528 has 96 divisors (see below), whose sum is σ = 16705962000. Its totient is φ = 1758426624.

The previous prime is 5721321523. The next prime is 5721321563. The reversal of 5721321528 is 8251231275.

5721321528 is a `hidden beast` number, since 572 + 1 + 32 + 1 + 52 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5721321492 and 5721321501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721321523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 978951 + ... + 984777.

Almost surely, 2^5721321528 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 5721321528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8352981000).

5721321528 is an abundant number, since it is smaller than the sum of its proper divisors (10984640472).

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

5721321528 is a wasteful number, since it uses less digits than its factorization.

5721321528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901 (or 6894 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 5721321528 is about 75639.4178190181. The cubic root of 5721321528 is about 1788.5405254366.

The spelling of 5721321528 in words is "five billion, seven hundred twenty-one million, three hundred twenty-one thousand, five hundred twenty-eight".