805428 has 36 divisors (see below), whose sum is σ = 2193828. Its totient is φ = 247680.

The previous prime is 805421. The next prime is 805451. The reversal of 805428 is 824508.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 459684 = 588^2 + 678^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 805428.

It is not an unprimeable number, because it can be changed into a prime (805421) by changing a digit.

805428 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 11 ways as a sum of consecutive naturals, for example, 393 + ... + 1328.

2⁸⁰⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

805428 is an abundant number, since it is smaller than the sum of its proper divisors (1388400).

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

805428 is a wasteful number, since it uses less digits than its factorization.

805428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744 (or 1739 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 805428 is about 897.4564056265. The cubic root of 805428 is about 93.0412581418.

The spelling of 805428 in words is "eight hundred five thousand, four hundred twenty-eight".