575721 has 8 divisors (see below), whose sum is σ = 852960. Its totient is φ = 383796.

The previous prime is 575717. The next prime is 575723. The reversal of 575721 is 127575.

575721 = 41² + 42² + ... + 121².

It is not a de Polignac number, because 575721 - 2² = 575717 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 21323 = 575721 / (5 + 7 + 5 + 7 + 2 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (575723) 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, 10635 + ... + 10688.

It is an arithmetic number, because the mean of its divisors is an integer number (106620).

2⁵⁷⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

575721 is a deficient number, since it is larger than the sum of its proper divisors (277239).

575721 is a wasteful number, since it uses less digits than its factorization.

575721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21332 (or 21326 counting only the distinct ones).

The product of its digits is 2450, while the sum is 27.

The square root of 575721 is about 758.7628087881. The cubic root of 575721 is about 83.1899168778.

It can be divided in two parts, 5757 and 21, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 575721 in words is "five hundred seventy-five thousand, seven hundred twenty-one".