428817 has 4 divisors (see below), whose sum is σ = 571760. Its totient is φ = 285876.

The previous prime is 428809. The next prime is 428833. The reversal of 428817 is 718824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 428817 - 2³ = 428809 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428807) 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, 71467 + ... + 71472.

It is an arithmetic number, because the mean of its divisors is an integer number (142940).

2⁴²⁸⁸¹⁷ is an apocalyptic number.

It is an amenable number.

428817 is a deficient number, since it is larger than the sum of its proper divisors (142943).

428817 is a wasteful number, since it uses less digits than its factorization.

428817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142942.

The product of its digits is 3584, while the sum is 30.

The square root of 428817 is about 654.8412021246. The cubic root of 428817 is about 75.4091417594.

The spelling of 428817 in words is "four hundred twenty-eight thousand, eight hundred seventeen".