578561 has 4 divisors (see below), whose sum is σ = 612612. Its totient is φ = 544512.

The previous prime is 578537. The next prime is 578563. The reversal of 578561 is 165875.

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 430336 + 148225 = 656^2 + 385^2 .

It is a cyclic number.

It is not a de Polignac number, because 578561 - 2⁶ = 578497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (578563) 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, 17000 + ... + 17033.

It is an arithmetic number, because the mean of its divisors is an integer number (153153).

It is a Proth number, since it is equal to 565 ⋅ 2¹⁰ + 1 and 565 < 2¹⁰.

2⁵⁷⁸⁵⁶¹ is an apocalyptic number.

It is an amenable number.

578561 is a deficient number, since it is larger than the sum of its proper divisors (34051).

578561 is a wasteful number, since it uses less digits than its factorization.

578561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34050.

The product of its digits is 8400, while the sum is 32.

The square root of 578561 is about 760.6319740847. The cubic root of 578561 is about 83.3264829924.

Subtracting from 578561 its reverse (165875), we obtain a triangular number (412686 = T₉₀₈).

The spelling of 578561 in words is "five hundred seventy-eight thousand, five hundred sixty-one".