428511 has 4 divisors (see below), whose sum is σ = 571352. Its totient is φ = 285672.

The previous prime is 428509. The next prime is 428531. The reversal of 428511 is 115824.

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

It is not a de Polignac number, because 428511 - 2¹ = 428509 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428531) 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, 71416 + ... + 71421.

It is an arithmetic number, because the mean of its divisors is an integer number (142838).

2⁴²⁸⁵¹¹ is an apocalyptic number.

428511 is a deficient number, since it is larger than the sum of its proper divisors (142841).

428511 is a wasteful number, since it uses less digits than its factorization.

428511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142840.

The product of its digits is 320, while the sum is 21.

The square root of 428511 is about 654.6075159972. The cubic root of 428511 is about 75.3912003934.

It can be divided in two parts, 428 and 511, that added together give a palindrome (939).

The spelling of 428511 in words is "four hundred twenty-eight thousand, five hundred eleven".