851664 has 40 divisors (see below), whose sum is σ = 2401632. Its totient is φ = 257920.

The previous prime is 851659. The next prime is 851671. The reversal of 851664 is 466158.

It is a congruent number.

It is an unprimeable number.

851664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279 + ... + 1334.

2⁸⁵¹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

851664 is an abundant number, since it is smaller than the sum of its proper divisors (1549968).

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

851664 is a wasteful number, since it uses less digits than its factorization.

851664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635 (or 1629 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 851664 is about 922.8564352054. The cubic root of 851664 is about 94.7885973218.

The spelling of 851664 in words is "eight hundred fifty-one thousand, six hundred sixty-four".