5728824721 has 3 divisors (see below), whose sum is σ = 5728900411. Its totient is φ = 5728749032.

The previous prime is 5728824667. The next prime is 5728824757. The reversal of 5728824721 is 1274288275.

It is a happy number.

The square root of 5728824721 is 75689.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 5709464721 + 19360000 = 75561^2 + 4400^2 .

It is a de Polignac number, because none of the positive numbers 2^k-5728824721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5728824791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 37845 + ... + 113533.

Almost surely, 2^5728824721 is an apocalyptic number.

5728824721 is the 75689-th square number.

5728824721 is the 37845-th centered octagonal number.

It is an amenable number.

5728824721 is a deficient number, since it is larger than the sum of its proper divisors (75690).

5728824721 is an frugal number, since it uses more digits than its factorization.

5728824721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151378 (or 75689 counting only the distinct ones).

The product of its digits is 501760, while the sum is 46.

The cubic root of 5728824721 is about 1789.3220408337.

The spelling of 5728824721 in words is "five billion, seven hundred twenty-eight million, eight hundred twenty-four thousand, seven hundred twenty-one".