576220721 has 4 divisors (see below), whose sum is σ = 591794292. Its totient is φ = 560647152.

The previous prime is 576220669. The next prime is 576220739. The reversal of 576220721 is 127022675.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 315559696 + 260661025 = 17764^2 + 16145^2 .

It is a cyclic number.

It is not a de Polignac number, because 576220721 - 2¹⁸ = 575958577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (576220741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7786730 + ... + 7786803.

It is an arithmetic number, because the mean of its divisors is an integer number (147948573).

Almost surely, 2^576220721 is an apocalyptic number.

It is an amenable number.

576220721 is a deficient number, since it is larger than the sum of its proper divisors (15573571).

576220721 is a wasteful number, since it uses less digits than its factorization.

576220721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15573570.

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

The square root of 576220721 is about 24004.5979137331. The cubic root of 576220721 is about 832.1397930055.

The spelling of 576220721 in words is "five hundred seventy-six million, two hundred twenty thousand, seven hundred twenty-one".