811664 has 20 divisors (see below), whose sum is σ = 1797504. Its totient is φ = 347808.

The previous prime is 811651. The next prime is 811667. The reversal of 811664 is 466118.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (811667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3512 + ... + 3735.

2⁸¹¹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

811664 is an abundant number, since it is smaller than the sum of its proper divisors (985840).

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

811664 is a wasteful number, since it uses less digits than its factorization.

811664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7262 (or 7256 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 811664 is about 900.9239701551. The cubic root of 811664 is about 93.2807640471.

The spelling of 811664 in words is "eight hundred eleven thousand, six hundred sixty-four".