891664 has 20 divisors (see below), whose sum is σ = 1803456. Its totient is φ = 426272.

The previous prime is 891661. The next prime is 891677. The reversal of 891664 is 466198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844 + ... + 1579.

2⁸⁹¹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

891664 is an abundant number, since it is smaller than the sum of its proper divisors (911792).

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

891664 is a wasteful number, since it uses less digits than its factorization.

891664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454 (or 2448 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 891664 is about 944.2796196043. The cubic root of 891664 is about 96.2499274751.

The spelling of 891664 in words is "eight hundred ninety-one thousand, six hundred sixty-four".