864580 has 24 divisors (see below), whose sum is σ = 1834560. Its totient is φ = 342240.

The previous prime is 864551. The next prime is 864581. The reversal of 864580 is 85468.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864581) 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, 2625 + ... + 2935.

It is an arithmetic number, because the mean of its divisors is an integer number (76440).

2⁸⁶⁴⁵⁸⁰ is an apocalyptic number.

It is an amenable number.

864580 is an abundant number, since it is smaller than the sum of its proper divisors (969980).

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

864580 is a wasteful number, since it uses less digits than its factorization.

864580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 864580 is about 929.8279410730. The cubic root of 864580 is about 95.2653706798.

It can be divided in two parts, 864 and 580, that added together give a square (1444 = 38²).

The spelling of 864580 in words is "eight hundred sixty-four thousand, five hundred eighty".