865438028 has 48 divisors (see below), whose sum is σ = 1890330624. Its totient is φ = 337538880.

The previous prime is 865438027. The next prime is 865438031. The reversal of 865438028 is 820834568.

It is a self number, because there is not a number n which added to its sum of digits gives 865438028.

It is not an unprimeable number, because it can be changed into a prime (865438027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9101 + ... + 42587.

It is an arithmetic number, because the mean of its divisors is an integer number (39381888).

Almost surely, 2^865438028 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 865438028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945165312).

865438028 is an abundant number, since it is smaller than the sum of its proper divisors (1024892596).

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

865438028 is a wasteful number, since it uses less digits than its factorization.

865438028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33582 (or 33580 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 865438028 is about 29418.3280966135. The cubic root of 865438028 is about 952.9687473579.

The spelling of 865438028 in words is "eight hundred sixty-five million, four hundred thirty-eight thousand, twenty-eight".