428647 has 4 divisors (see below), whose sum is σ = 435736. Its totient is φ = 421560.

The previous prime is 428639. The next prime is 428657. The reversal of 428647 is 746824.

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

It is a cyclic number.

It is not a de Polignac number, because 428647 - 2³ = 428639 is a prime.

It is a d-powerful number, because it can be written as 4³ + 2¹⁷ + 6⁷ + 8³ + 4⁴ + 7⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428657) 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, 3453 + ... + 3574.

It is an arithmetic number, because the mean of its divisors is an integer number (108934).

2⁴²⁸⁶⁴⁷ is an apocalyptic number.

428647 is a deficient number, since it is larger than the sum of its proper divisors (7089).

428647 is an equidigital number, since it uses as much as digits as its factorization.

428647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7088.

The product of its digits is 10752, while the sum is 31.

The square root of 428647 is about 654.7113867957. The cubic root of 428647 is about 75.3991753880.

The spelling of 428647 in words is "four hundred twenty-eight thousand, six hundred forty-seven".