820578 has 16 divisors (see below), whose sum is σ = 1790496. Its totient is φ = 248640.

The previous prime is 820577. The next prime is 820597. The reversal of 820578 is 875028.

It is not an unprimeable number, because it can be changed into a prime (820577) 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, 6151 + ... + 6282.

It is an arithmetic number, because the mean of its divisors is an integer number (111906).

2⁸²⁰⁵⁷⁸ is an apocalyptic number.

820578 is an abundant number, since it is smaller than the sum of its proper divisors (969918).

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

820578 is a wasteful number, since it uses less digits than its factorization.

820578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12449.

The product of its (nonzero) digits is 4480, while the sum is 30.

The square root of 820578 is about 905.8576047040. The cubic root of 820578 is about 93.6210030302.

The spelling of 820578 in words is "eight hundred twenty thousand, five hundred seventy-eight".