856620 has 36 divisors (see below), whose sum is σ = 2598960. Its totient is φ = 228384.

The previous prime is 856571. The next prime is 856627. The reversal of 856620 is 26658.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2200 + ... + 2559.

2⁸⁵⁶⁶²⁰ is an apocalyptic number.

It is an amenable number.

856620 is an abundant number, since it is smaller than the sum of its proper divisors (1742340).

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

856620 is a wasteful number, since it uses less digits than its factorization.

856620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774 (or 4769 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 856620 is about 925.5376815668. The cubic root of 856620 is about 94.9721063075.

The spelling of 856620 in words is "eight hundred fifty-six thousand, six hundred twenty".