505578 has 8 divisors (see below), whose sum is σ = 1011168. Its totient is φ = 168524.

The previous prime is 505573. The next prime is 505601. The reversal of 505578 is 875505.

It is a happy number.

505578 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

505578 is an admirable number.

It is a super-2 number, since 2×505578² = 511218228168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505573) by changing a digit.

505578 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 42126 + ... + 42137.

It is an arithmetic number, because the mean of its divisors is an integer number (126396).

2⁵⁰⁵⁵⁷⁸ is an apocalyptic number.

505578 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505578 is a wasteful number, since it uses less digits than its factorization.

505578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84268.

The product of its (nonzero) digits is 7000, while the sum is 30.

The square root of 505578 is about 711.0400832583. The cubic root of 505578 is about 79.6641125523.

Adding to 505578 its product of nonzero digits (7000), we get a triangular number (512578 = T₁₀₁₂).

The spelling of 505578 in words is "five hundred five thousand, five hundred seventy-eight".