52747721 has 8 divisors (see below), whose sum is σ = 56899080. Its totient is φ = 48609792.

The previous prime is 52747703. The next prime is 52747741. The reversal of 52747721 is 12774725.

It can be written as a sum of positive squares in 4 ways, for example, as 6996025 + 45751696 = 2645^2 + 6764^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52747721 - 2¹⁰ = 52746697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52747741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5735 + ... + 11763.

It is an arithmetic number, because the mean of its divisors is an integer number (7112385).

Almost surely, 2^52747721 is an apocalyptic number.

It is an amenable number.

52747721 is a deficient number, since it is larger than the sum of its proper divisors (4151359).

52747721 is a wasteful number, since it uses less digits than its factorization.

52747721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6715.

The product of its digits is 27440, while the sum is 35.

The square root of 52747721 is about 7262.7626286421. The cubic root of 52747721 is about 375.0316322946.

The spelling of 52747721 in words is "fifty-two million, seven hundred forty-seven thousand, seven hundred twenty-one".