811728 has 40 divisors (see below), whose sum is σ = 2331200. Its totient is φ = 270432.

The previous prime is 811709. The next prime is 811729. The reversal of 811728 is 827118.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508 + ... + 1371.

It is an arithmetic number, because the mean of its divisors is an integer number (58280).

2⁸¹¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

811728 is an abundant number, since it is smaller than the sum of its proper divisors (1519472).

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

811728 is a wasteful number, since it uses less digits than its factorization.

811728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896 (or 1884 counting only the distinct ones).

The product of its digits is 896, while the sum is 27.

The square root of 811728 is about 900.9594885454. The cubic root of 811728 is about 93.2832157233.

The spelling of 811728 in words is "eight hundred eleven thousand, seven hundred twenty-eight".