856580 has 12 divisors (see below), whose sum is σ = 1798860. Its totient is φ = 342624.

The previous prime is 856571. The next prime is 856627. The reversal of 856580 is 85658.

It can be written as a sum of positive squares in 2 ways, for example, as 515524 + 341056 = 718^2 + 584^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21395 + ... + 21434.

It is an arithmetic number, because the mean of its divisors is an integer number (149905).

2⁸⁵⁶⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

856580 is an abundant number, since it is smaller than the sum of its proper divisors (942280).

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

856580 is a wasteful number, since it uses less digits than its factorization.

856580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42838 (or 42836 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 856580 is about 925.5160722537. The cubic root of 856580 is about 94.9706280389.

The spelling of 856580 in words is "eight hundred fifty-six thousand, five hundred eighty".