5721647 has 4 divisors (see below), whose sum is σ = 5726640. Its totient is φ = 5716656.

The previous prime is 5721631. The next prime is 5721649. The reversal of 5721647 is 7461275.

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 is a cyclic number.

It is not a de Polignac number, because 5721647 - 2⁴ = 5721631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5721649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179 + ... + 3387.

It is an arithmetic number, because the mean of its divisors is an integer number (1431660).

Almost surely, 2^5721647 is an apocalyptic number.

5721647 is a deficient number, since it is larger than the sum of its proper divisors (4993).

5721647 is a wasteful number, since it uses less digits than its factorization.

5721647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4992.

The product of its digits is 11760, while the sum is 32.

The square root of 5721647 is about 2391.9964464857. The cubic root of 5721647 is about 178.8574440027.

The spelling of 5721647 in words is "five million, seven hundred twenty-one thousand, six hundred forty-seven".