817028394 has 64 divisors (see below), whose sum is σ = 2014553856. Its totient is φ = 215115264.

The previous prime is 817028393. The next prime is 817028417. The reversal of 817028394 is 493820718.

817028394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (817028393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 510804 + ... + 512400.

It is an arithmetic number, because the mean of its divisors is an integer number (31477404).

Almost surely, 2^817028394 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 817028394, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1007276928).

817028394 is an abundant number, since it is smaller than the sum of its proper divisors (1197525462).

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

817028394 is a wasteful number, since it uses less digits than its factorization.

817028394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 817028394 is about 28583.7085417550. The cubic root of 817028394 is about 934.8581458087.

The spelling of 817028394 in words is "eight hundred seventeen million, twenty-eight thousand, three hundred ninety-four".