428444823 has 4 divisors (see below), whose sum is σ = 571259768. Its totient is φ = 285629880.

The previous prime is 428444773. The next prime is 428444839. The reversal of 428444823 is 328444824.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 428444823 - 2²¹ = 426347671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428444873) 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, 71407468 + ... + 71407473.

It is an arithmetic number, because the mean of its divisors is an integer number (142814942).

Almost surely, 2^428444823 is an apocalyptic number.

428444823 is a deficient number, since it is larger than the sum of its proper divisors (142814945).

428444823 is a wasteful number, since it uses less digits than its factorization.

428444823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142814944.

The product of its digits is 196608, while the sum is 39.

The square root of 428444823 is about 20698.9087393515. The cubic root of 428444823 is about 753.8731918588.

Subtracting from 428444823 its reverse (328444824), we obtain a palindrome (99999999).

The spelling of 428444823 in words is "four hundred twenty-eight million, four hundred forty-four thousand, eight hundred twenty-three".