858660 has 48 divisors (see below), whose sum is σ = 2624832. Its totient is φ = 208000.

The previous prime is 858631. The next prime is 858673. The reversal of 858660 is 66858.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10 + ... + 1310.

It is an arithmetic number, because the mean of its divisors is an integer number (54684).

2⁸⁵⁸⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 858660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1312416).

858660 is an abundant number, since it is smaller than the sum of its proper divisors (1766172).

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

858660 is a wasteful number, since it uses less digits than its factorization.

858660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 858660 is about 926.6390883186. The cubic root of 858660 is about 95.0474370661.

It can be divided in two parts, 8586 and 60, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 858660 in words is "eight hundred fifty-eight thousand, six hundred sixty".