809018028 has 108 divisors (see below), whose sum is σ = 2561963040. Its totient is φ = 213361344.

The previous prime is 809018009. The next prime is 809018029. The reversal of 809018028 is 820810908.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 809017983 and 809018001.

It is not an unprimeable number, because it can be changed into a prime (809018029) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5293 + ... + 40571.

It is an arithmetic number, because the mean of its divisors is an integer number (23721880).

Almost surely, 2^809018028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809018028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280981520).

809018028 is an abundant number, since it is smaller than the sum of its proper divisors (1752945012).

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

809018028 is a wasteful number, since it uses less digits than its factorization.

809018028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35316 (or 35304 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 809018028 is about 28443.2422202533. The cubic root of 809018028 is about 931.7929062112.

The spelling of 809018028 in words is "eight hundred nine million, eighteen thousand, twenty-eight".