811428 has 12 divisors (see below), whose sum is σ = 1893360. Its totient is φ = 270472.

The previous prime is 811411. The next prime is 811429. The reversal of 811428 is 824118.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 811398 and 811407.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 811428.

It is not an unprimeable number, because it can be changed into a prime (811429) 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, 33798 + ... + 33821.

It is an arithmetic number, because the mean of its divisors is an integer number (157780).

2⁸¹¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

811428 is an abundant number, since it is smaller than the sum of its proper divisors (1081932).

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

811428 is a wasteful number, since it uses less digits than its factorization.

811428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67626 (or 67624 counting only the distinct ones).

The product of its digits is 512, while the sum is 24.

The square root of 811428 is about 900.7929839869. The cubic root of 811428 is about 93.2717223770.

The spelling of 811428 in words is "eight hundred eleven thousand, four hundred twenty-eight".