5721345729 has 18 divisors (see below), whose sum is σ = 9083754498. Its totient is φ = 3467481600.

The previous prime is 5721345713. The next prime is 5721345737. The reversal of 5721345729 is 9275431275.

It is a happy number.

5721345729 is a `hidden beast` number, since 5 + 72 + 1 + 3 + 4 + 572 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3751317504 + 1970028225 = 61248^2 + 44385^2 .

It is not a de Polignac number, because 5721345729 - 2⁴ = 5721345713 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5721345029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2625792 + ... + 2627969.

Almost surely, 2^5721345729 is an apocalyptic number.

It is an amenable number.

5721345729 is a deficient number, since it is larger than the sum of its proper divisors (3362408769).

5721345729 is a wasteful number, since it uses less digits than its factorization.

5721345729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5253789 (or 5253775 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 5721345729 is about 75639.5777949613. The cubic root of 5721345729 is about 1788.5430472554.

The spelling of 5721345729 in words is "five billion, seven hundred twenty-one million, three hundred forty-five thousand, seven hundred twenty-nine".